The only SSB game I've played in the last 2 years was Brawl, but I could probably go for this if I happen to pick it up and learn how to play it.
This is one of the reasons why I dislike series games where the new games aren't just direct port expansions of their precursors. Certainly, original content is fabulous, but this is also the reason why I have to use StepMania for the DDR, because it would just be lame to have only 80 songs available to play, switching disks frequently is a PAIN IN THE ASS, and for a tournament, everything has to be identical, including theme, timing, and scoring system. Sorry to rant here. I can certainly see the reason in having a quite serious SSBM tournament by that argument as well as SSBB. (I'll similarly argue that a SC3 tournament would be better than SC4, based on the crap I've seen Capcom putting out with SC4.)