The Joker is expected to be more sinister and less of a prankster in this version
And that right there is the reason Comic Book into Movies will never ever be able to manage anything above a 3.5/5
Villians I want to see in future movies are Poison Ivy, Lady Deathstrike(reprising), Magneto(reprising), Toad(reprising), Pyro(reprising), Scarecrow (reprising), Dr. Doom (reprising), Lizard, Carnage, Apocalypse...
Of course keeping Juggernaut, Sandman, Venom & Blackheart in mind for any future continuations post the ones that will follow the most recently released.
Maybe throw in Franklin Richards, Agatha Harkness, Bat Girl, Robin, Dazzler, Bishop & Silver Surfer to root for the heros in the future.
X-2 is post Rise of the Silver Surfer because when Mystique is looking through William Stryker's computer you can see a folder called "Franklin Richards"
The writers for both DC & Marvel must be fully aware of plot holes.
Perhaps they should have a ghost rider, daredevil, fantastic four & x-men cross over (cause the film rights are all owned by the same movie production company) cross over with Thanos and the Infinity Gauntlet. Of course you'd have to have Magneto, Silver Surfer, Galactus & Deadpool on the hero's team.