Overeem kicked ass last night. Looks like Arlovski's days as an elite heavyweight are coming to an end.
As far as your feelings on Anderson Silva goes, you can look at it two ways. If you look at MMA as a fight, then yeah, Silva didn't live up to his end of the bargain.
If you view it as a sport, then there should be no issue with what he did. No one ever complains about a defensive minded football, soccer, basketball, hockey, etc etc team. Why should you complain when a fighter does his job to win?
The showboating, the silly antics, I don't really care for them myself. But if Silva wants to win by decision everytime, then as a sports watcher, I have no issue with that. Champions are in the enviable position where the challenger needs to take the belt from them.
Silva is a counter puncher and if the opponent doesn't press the fight, then Silva sees no need to put himself in danger. Anderson doesn't owe the spectators anything other than to continue winning.
Do I think Silva was an idiot in his fight against Maia? Sure. Do I think it's Silva's obligation to entertain the fans? No, not really, I think it's his obligation to win, if this is indeed a sport, we need to treat it like any sport. The more we lust for blood, the more it just makes it seem like a cock fight.
To me, this is a sport, and in sports, the goal is winning. That is why, even though I don't care for it much, I don't fault Silva for his fighting style.