I think Smash Bros is the only fighting game I can really get into. The big thing that makes it great is the smash moves are relatively easy to perform. I remember how complicated some of the moves in Mortal Kombat were, and that just launching a fireball or roundhouse kick required long and specific button combinations that sometimes felt like you were trying to enter a cheat code. Plus you had to have that memorized in advanced. At least with Smash Bros, even if you've never played the character before, you know a Up+A smash is usually going to direct some kind of attack above you, a Forward+A smash is going to direct an attack in front of you, and so on. And it's nice that the same formula usually applies to every character with only a few exceptions. It's more of a matter of learning what the attacks and moves do rather than memorizing and learning how to trigger them in the first place. That knocks a BIG step off the learning curve.

Plus it's one of those games that you can make as serious or as zany as you want it to be. The massive amount of customization is wonderful. :3