You don't have 3 top tier guards and you don't have 3 top tier bigs. That is just myopic. You have a 21 year old that is very talented but bigs don't usually learn how to win for a few years and then you have a bunch of players that are slightly above average for their position. Almost all of them have some glaring weakness in their game. Reke can't shoot and hasn't shown the ability to make the right play consistently in his career. Gordon is always hurt, AD can't score in the post and gets pushed around on post defense, Asik doesn't run well and doesn't have a very refined offensive game, Anderson isn't strong enough to defend post players or rebound and he has almost no inside game. Jrue is a solid player but given his position is the deepest in the league he isn't outstanding.
You have some players that are good players, players that do one or two things well. Players that can look like all stars but can also look like they don't belong on the floor all in the same game. This isn't just on the coach, the players just aren't as good as some of the fan base seems to think they are.