Why do people hate on the Heat? Just because they have the best team?

I mean Cleveland was a lousy team. LeBron had no good players on that team. So I think it was smart for him to switch to a team like the Heat where he can team up with other superstars. I mean we're talking about 3 all-stars on one team here. They are guaranteed to win titles. I think players like Nowitzki who stay at the same team throughout the years are really stupid. I mean he's the only all-star on that team. Imagine he had gone to a team like the Lakers. He also could have won many titles like LeBron will instead of doing it the hard way like that.