Good Game although it doesn't get old after a while... Main let down is the games repetativeness.
Next to nobody plays this game online most of the time you'll be waiting atleast 20 minutes before someone joins your game or hosts their own.
You can level up you characters and as they advance they will unlock more skills, for example at the start of the game Spider-Man has one or two skills which arn't overly exciting, shooting web balls and webbing your opponents feet but after a while he will get spidey sense (the enemies go in slow motion) and web bungee (He will catapult himself at the opponent using his web).
There are plenty of unlockables but i doubt many people have the patience to unlock them all.... For example to unlock The Silver Surfer you need to complete every single training mission... But i suppose if you did unlock him it'd be a great thing to show off in online play.