I don't think Kevin is a flopper but since the knee injury it has become obvious that he can't really be expected to to carry this team night in and out in the same manner that he was during his Timberwolves days.
That wouldn't be such a problem if, say Rondo or a bench player had enough offensive skills to keep our team in games so that the Big 3 wouldn't always be expected to do the majority of our scoring each night (see Chris Paul/Manu Ginobili). If we had something like this then it would obviously take alot of pressure off of the Big 3, though Pierce, Ray, and KG are all still capable of putting up at least 15 to 20 points each night.