This 'Street Fighter II'/'Mortal Kombat' mixture is a success!
The move variety in this game is probably the best in any game throughout the 20th century. You could almost do any move you can think of (thus why it would be a good WII game)(Just a suggestion!).
The Overkills are rubbish, however, and there is no blood at all (Forgive me for being a OH MY GOD BLOOD EVERYWHERE KILL THEM ALL AND EAT THEM fan).
However, the gameplay is BRILLIANT for 2 player modes, and their idea for a battle sphere thingy (which limits your amount of special moves) outstrips 'Mortal Kombat's' Run Meter and Combo meter gauge (Street Fighter-well-could do with all of the three, with Blanka just consistently using Electricity, then using one of his rollouts.)
However(again), the game is almost IMPOSSIBLE.(Luckily its not IMPOSSIBLE, like some games I know (like the Hulk on PS2 which is impossible to complete without cheats.)
Overall it is a great game. And please remember that:
life is a game. PLAY IT.