Maybe a bit a hard at first, but fun when you know it.
First let me say the positive:
A LOT OF CHARACTERS, around 30, and 2 unlockables.
SNK played a bit in creating this game, characters are from various games (Darkstalkers, Metal Slug, Fatal Fury, KOF, Street fighter, Megaman...), and made some irreguellar moves, like Zero's cyberelf's moves (when he summons little bots), or included the very weird and funny looking 'Mars People' from Metal Slug.
Fun gameplay when you know a character, and play pretty well with it.
A fighting game is always fun too, when you don't know what to do, just pick up and play.
Cool Supercombos and new Exceed moves.
Pretty cheap (around 25-35 euros, I live in Europe)
Great depth, so you can always learn something new.
Now the negative:
Not really good graphics and music, some stages look normal, but some just suck, when you know this game, you will hopefully forget it.
Not really much to unlock :( only 2 characters unlockable (on the other hand, it already has a lot of characters), and pictures, in the Art Gallery
Not many modes: Survival, Arcade, Gallery, Option and Training :( (correct me if I'm wrong)
Sometimes frustrating.
In the end:
A bit short, but you can always play, if you feel like it, technical not so good,
but very fun.