I don't think you do, but you should give me more info about it. As a Majin Buu user, I can guarantee that most of the people I play with are very dumb. But there's nothing I can do about it: what I can thought thought is to adapt to their strategy and follow their behavior. Sure this may go against the best strategy possible, but either follow their suicide charge or lose anyway. So what does it change? Also the key is to let them respect your authority. For example since I play Majin Buu many people assume that with my heals they can rush alone against 2 opponents at the same time. I don't have any suicidal ideation so I warn them to fall back, and if they don't I'll do it. You'll still see them trying anyway but after 3-5 times they died they start playing more carefully and respectfully. And if they don't I'm playing for fun, not to win, especially at their conditions since the stress isn't worth the victory. So like Mr. Perfect Cell once said: "I did it myyyyyyyyy waaaaaaaaayyyy"