I don't mind him not attacking because of his inability to nail the FT's. Because of how efficient this team is, I'd prefer ball movement until a good shot is found then him at the line with a decent chance at 1 point.
As great as Rondo is, he is sometimes frustrating to watch. Sure he racks up assists, but a lot of guys would with the starters we have. Any doubt Nash wouldn't average close to 14 APG with KG, Ray, Paul, and Shaq? CP3 and DWill would be 12+ as well IMO.
But those guys would not allow the defense to sag off him, because they can all bury a wide open shot from anywhere, OR drive to the rim with the ability to finish, draw the foul (and hit their FT's at a good clip), or find the open man.
On defense, I find him gambling way too much for steals lately instead of just staying in front of his man. With such a great defense behind him, his mistakes are masked. Letting someone like Derek Fisher get to the rim at any time is inexcusable.
Rondo is the "best player on the C's" when everyone else around him are making their shots. When they aren't, he can't will this team to a win, because he can't knock down shots with regularity and is unwilling to attack the rim.
Basically, Rondo is only great when everyone else is.