I remember the days where people would argue that Rondo is better than Jose Calderon and T.J. Ford. I think those particular arguments should be put to rest.
Rondo looks overwhelmed right now, and also looks like he's not as quick as usual, suggesting perhaps an injury. Mostly, though, the issue seems to be mental; he can't shoot anymore (he was decent last season) and he's out of control driving to the hoop lately.
I'm not going to panic, though. He was inconsistent last season, but when he was "on", he was a perfectly viable point guard on a championship squad. It is a little disappointing to see him regress, though.