Ultimate Mortal Kombat review at Gamedaily.

"Ultimate Mortal Kombat for the Nintendo DS hits with a great deal of power thanks to one key addition – online compatibility.

Don't bother playing through the game in single-player mode. You win a few matches at first, but then the artificial intelligence smacks you to the ground, no matter what you do. Projectile attack? It avoids it and kicks you in the face. Jumping attack? It counters with its own quicker jumping attack. Foot sweep? It moves out of range and then closes in for the kill. It almost gets to the point that you'll want to break your DS."

Full Source: Gamedaily via Gonintendo