Rubio has been statistically one of the worst PG's in the entire NBA this year.
That seems a bit harsh for the guy with the most steals in the league and the third most assists. He is a way above average rebounder from the position at 4.5 a game. He is also 34.7% from three point range and 81.4% from the line. He has been awful from 2 point range though.
I don't think Rubio is a terrible player by any means and I should have said "starting PG". Obviously there are any number of backup PG's far worse.
That said, offensively, a PER of 15 and averages of 8.8 PPG on 36% FG is pretty bad for a starting PG. He only attempts 3 free throws per game, so his high FT% is not too meaningful. Neither is his 3P% (1.6 attempts per game). He is a good passer and rebounder. He also plays passing lanes well, but is otherwise pretty ineffective on defense.
Statistically, he's pretty poor, overall. Certainly never lived up to the initial hype.