Yay ! Another SSF2 player
My list would probably be this way :
1) Project M. Because Melee gameplay, Brawl graphics, annoying AI.
2) Melee and 4 tied. Because one has an amazing gameplay but lacks features, the other one has a restrained gameplay but amazing features.
4) SSF2. Because it has an interesting gameplay and can be played online.
5) Smash 64. I never played it but it is surely better than Brawl since it had an option to disable random. Maybe it I tried it it would rank higher, I don't know.
6) Super Tripping Bros Brawl. You jump twice with Falco, you can cook pasta while waiting for him to land back on stage. In the meantime, Fox tries to dash to get under you and charge an up smash but falls for no reason due to a random number generator. Useless game.