Mario Kart online is good from what I've played, minus the voicechat. Not having FFA battle mode and 2-player (or more) grand prix isn't good, though, but that's not an online problem...
But the last time I tried Brawl it took far too long for each match to start. You end up waiting more than playing. Maybe it's gotten better?
Friend codes and voice chat kind kill the overall experience, though...it's annoying just to add friends and you can't talk to them.







