gee it is so laggy for me to play online! I hope that the new super smash for wiiU has a better online experience.. Mario kart has CERO lag and it can be up to 12 people at the same time, why the hell did nintendo never fix ssbb's online stuff?? D:
1: The Wii can't patch games 'n stuff, so there's 100% no way for Ninty to fix anything once the game is released.
2: Brawl's online isn't all-that problematic, aside from getting kicked from the server every once in awhile. The problem is that it's buffer system and how data is transferred means it can't function like MKW's multiplayer. MKW actually has a LOT of lag, but how it handles it works much differently then Brawl, so it seems like it has none at all.
In short, Brawl wasn't made very well in regards to how it handles online lag (everyone is as slow as the player with the worst connection; a lot of people have shitty connections). MKW was designed quite properly for online play.