Marvel movies have been around for decades, before the MCU kicked off in 2008 with the release of Iron Man. These movies, both within and outside the MCU, were not always successful in adapting the sprawling comic universe. Despite memorable successes, such as Sam Raimi's Spider-Man, some movies featuring Marvel characters didn't always work. The list below contains some of these titles:Five Marvel titles that were not as good as their comic storylines: View this post on Instagram Instagram PostHere is the list of five Marvel movies that adapted popular comic book storylines that failed to live up to what was in the pages. Also, this list includes movies that fall under the MCU continuity and outside it.Iron Man 2, 2010 (Demon in a Bottle)Iron Man was not a major Marvel character before the 2008 movie. Therefore, Tony Stark's current iconic status is due to the first MCU movie. Thus, fans were stoked to meet Robert Downey Jr.'s Tony Stark again in Iron Man 2 (2010). The sequel adapts the nine-issue 1979 comic book storyline Demon in a Bottle. For the uninitiated, this 1979 storyline is one of Iron Man’s most iconic.Iron Man 2, like Demon in a Bottle, is about Tony Stark dealing with alcoholism. But the movie lost fans as soon as it was released, as the latter preferred the plot of Demon in a Bottle over that of the 2010 sequel."With the world now aware that he is Iron Man, billionaire inventor Tony Stark faces pressure from all sides to share his technology with the military. He is reluctant to divulge the secrets of his armored suit, fearing the information will fall into the wrong hands. With Pepper Potts and "Rhodey" Rhodes by his side, Tony must forge new alliances and confront a powerful new enemy."Avengers: Age of Ultron, 2010 (Age of Ultron)Avengers: Age of Ultron (2015) shares its title with the 2013 Marvel event, also titled Age of Ultron. However, that's where this connection ends. The 2013 comic is an epic crossover event that's set in two Earths. The 2015 Avengers sequel, on the other hand, is about The Avengers' attempts to destroy Ultron, the AI Tony Stark created in the MCU.The movie takes some major leaps without any buildup. Natasha Romanoff and Bruce Banner's romance comes out of nowhere. Thor's vision about the infinity stones and Quicksilver's death are still a point of contention for the fans."Marvel Studios presents “Avengers: Age of Ultron,” the epic follow-up to the biggest Super Hero movie of all time. When Tony Stark tries to jumpstart a dormant peacekeeping program, things go awry and Earth’s Mightiest Heroes, including Iron Man, Captain America, Thor, The Incredible Hulk, Black Widow and Hawkeye, are put to the ultimate test as the fate of the planet hangs in the balance. As the villainous Ultron emerges, it is up to the Avengers to stop him from enacting his terrible plans, and soon uneasy alliances and unexpected action pave the way for an epic and unique global adventure."Thor: Love and Thunder, 2022 (Jason Aaron run)Thor: Love and Thunder is one of the MCU's most disliked projects because it adapts celebrated elements from the Thor comics: Jane Foster's Thor. Taika Waititi also hyped up Gorr the God Butcher as one of the best MCU villains. However, even though Christian Bale was fantastic, he did not kill many Gods in the movie despite the "God Butcher" moniker."Marvel Studios’ “Thor: Love and Thunder” finds the God of Thunder on a journey unlike anything he’s ever faced—one of self-discovery. But his efforts are interrupted by a galactic killer known as Gorr the God Butcher, who seeks the extinction of the gods. To combat the threat, Thor enlists the help of King Valkyrie, Korg and ex-girlfriend Jane Foster, who—to Thor’s surprise—inexplicably wields his magical hammer, Mjolnir, as the Mighty Thor."X3: The Last Stand, 2006 (Gifted and The Dark Phoenix Saga) View this post on Instagram Instagram PostThe first two X-Men movies are among the most celebrated pre-MCU Marvel movies. However, filmmaker Bryan Singer did not return to direct the third movie in the franchise despite setting it up in the closing minutes of X2. As Singer helmed 2006's Superman Returns, Brett Ratner directed the same year's equally maligned X3: The Last Stand.X2 ends with a hint that Jean Grey survived drowning in the Alkali Lake, as we see a Phoenix shape. This had fans hyped as the third movie was going to adapt Chris Claremont's celebrated Dark Phoenix Saga, which is about the X-Men trying to ward off the extraterrestrial Phoenix Force's corrupting influence from Jean Grey.However, The Last Stand combines Chris Claremont’s iconic Dark Phoenix Saga with Joss Whedon’s 2005 storyline Gifted, which centers on a scientist creating a cure for the mutant gene. Fans also disliked that the movie portrays Phoenix as Jean Grey’s alternate personality rather than as the extraterrestrial force that possesses Marvel Girl.Spider-Man 3, 2007 (Alien Costume Saga)No conversation about disappointing Marvel movies can go without mentioning Spider-Man 3. Fans felt betrayed by this movie after Sam Raimi knocked the ball out of the park with the first two movies, especially Spider-Man 2. However, the black suit featured in the marketing material had fans because the movie was adapting the Alien Costume Saga, which introduces symbiotes.The iconic and celebrated comic storyline introduced a new, darker side to Peter that fans did not realize. An extraterrestrial symbiote latches itself onto Peter and gives him the ability to shoot webs without mechanical web shooters. But these upgrades come with a cost: Peter becomes even more aggressive and vengeful. This storyline has been adapted multiple times in animated shows.This is why it wasn't surprising when the makers chose this popular comic. Despite its box office success, Spider-Man 3 is criticized by fans for its multiple villains and lack of Venom. If you remember, Venom dies after a few minutes of screen time, much to the chagrin of the fans."Peter Parker (Tobey Maguire) finally has the girl of his dreams, Mary Jane Watson (Kirsten Dunst), and New York City is in the throes of Spider-mania! But when a strange alien symbiote turns Spider-Man's suit black, his darkest demons come to light changing Spider-Man inside as well as out. Spider-Man is in for the fight of his life against a lethal mix of villains - the deadly Sandman (Thomas Haden Church), Venom (Topher Grace), and the New Goblin (James Franco) - as well as the enemy within himself."There are several other titles other than these five that disappointed fans over the years. However, it must be noted that for every failure, Marvel has managed to score a win on the big screen. Iron Man (2008) was released just a year after Spider-Man 3. Similarly, the acclaimed Spider-Man 2 (2004) was released just after the back-to-back critical brickbats of Daredevil and Hulk, both from 2003.