Good time waster, if you can TOTALLY look past the repetition gameplay.
So, if you're looking for a brainless button masher, this is a rather good choice. Though the game lets you fight a standard order of enemies every time, the only consolation is that you get to unlock a new character to fight each time you complete a cycle. For me, probably the only things I enjoy the gruelling battles is to finally get to read the intro text of the characters you unlock (ha...), and for players familiar with Marvel Trading Card Game, this game does introduce trading cards sort of feature to add on to your character's power, where every fight you won garners a random card. Also, if you like the idea, the cards have a certain color or character name code that can "combine" in your power list to unlock a special ability or effect, which provides another reason to look past the mindless fights.
KingLim