Perhaps you've seen the reviews from professional game critics, and you've seen this game is getting about a 6.x out of 10. That doesn't paint a very pretty picture for this game, nor would I call it an accurate review. Everyone seems to agree that this game will not lure anyone who doesn't play the Marvel TCG to want to play it, thus it gets a less-than-desirable score. That may be true, but for those who do already play it, this game is alot of fun.
The game gives players of the Marvel TCG pretty much what they'd want. There's a 2 single player campaigns, Hero and Villain. They seem to be pretty lengthy campaigns, especially when each game will take you between 15-20 minutes to complete. Victory will give you points to buy more cards you can use to customize your deck(s). There's also online multiplayer, which to me, is where the real treat is in this game. Simply put, if you like the Marvel TCG, you'll like this game.
There are tutorials for those who haven't. They're somewhat wordy, and may not introduce the rules as well as if you were playing the real game. It had been a few years since I'd touched the game, but the tutorials did a good enough job to refresh my memory.
There's not much to say about graphics, since this is a card game, but what's there does the job. I especially like the abundance of artwork throughout the game and menus. The videos are done in a comic book style, which is fun. The music is so-so, and there's no voice acting. Fine by me, since most comic book games feature some really cheesy voice acting.
Bottom line, if you like the game already, this is a very good buy. It's a well put together game, and has plenty to keep you occupied. It does not deserve low score just because it isn't for everyone. It's not as expensive as other PSP games, so that a plus. I'm having alot of fun with it.