I love MK: A. My personal favorites are Johnny Cage, Raiden, Jax, and Noob Saibot. The variety of characters is great, and the kreate a fighter doesn't have too bad of a set up. I remember my friends and I created Sephiroth and Goku and had them battle. It's one of the best Mortal Kombat games in awhile. Will never beat MK II or MK III ultimate though. The only thing I miss are the signature fatalites.
And as for conversation about Liu Kang, yeah, he's not that great of a "good" guy. His special attacks are pathetic, and even though he's basically modeled off Bruce Lee, he's not that good of a character in MK. Then again it's Scorpion and Subzero that make the Mortal Kombat series so well known.