A lot to be said for keeping a core together, they are good example, but I think what makes them solid is three things:
1) They make a hard effort on D. They swarm and trust each other well and play great team D.
2) They have a nice balance on inside and outside on their offense. With their personnel all they have to do is play to spread the floor and it happens with their respective talents.
3) They have solid personnel across the board. You can't really slack off any of them. All of them can hurt you so other teams have to play honest. Collectively, their talent is much more than some individual talent that some teams present.
The playoffs is a whole new ballgame though, time will tell if they can do it when other teams turn it up a notch.