Boys, boys, boys... Relax a bit... All the players do take a beating during games. The bigger the star, usually the bigger the beating. Since Garnett is next to impossible to stop one-on-one, he gets help defenses around alot and the defenders try to stop him with some dirtier tricks... Because the clean ones just won't work. This is essentially the same for all the star players in the league. Of course there are differences in the ways that guys play that can effect the amount of beating, like with D-Wade and Iverson relentlessly attacking the rim with reckless abandon or Stojakovic etc. guys that score a lot of their points from away from the basket probably don't get beat up as bad as the guys who go to the rim over and over again.
When this all is factored in for Garnett... Well, his offense isn't the most aggressive one, he does lots of jumpers and generally has no need to get to the rim every time. Thus he probably isn't hit as much, but he is one of the best offensive rebounders in the league and those rarely come easy sometimes the contact is pretty rough on those plays, so he gets a whole lot of that in each game. And as one of the biggest stars in the league, he probably gets his share of dirty tricks in the post so the beating is probably pretty bad...
He gets beat up like everyone else... I would think that this is probably on the same level as Duncan, Shaq and Amare... Even Shaq has wondered a couple of years back that how Iverson can handle the beating he takes on the court... That is certainly a good question
Garnett doesn't play the aggressive style, because he can get it done by other means that are effective to him... KG's consistency is the reason he is so great. Some players have great games and then fade for a while, but KG never seems to let up and always is playing at a high level and the stats show that to its fullest. He is a miraculous player that can easily carry a team with some talent... Unlucky for him, the team has not had any talent in recent years.