So because some were declined or off-set you are giving him a pass ?
GRob received 16 penalties, not saying Zuttah's 6 were good, but still no comparison.
As for PFF, I'll go with PFF over fan votes most anytime, not that there aren't some exceptionally intelligent fan observations, but many are too emotionally involved to be unbiased, ... and even if imperfect, PFF has a pretty good method for breaking down scoring & grading. Nobody is claiming it as a bible, but it is a good guide, and allows us to compare what we observe for ourselves to what many retired and other coaches working for PFF compile on a play by play basis. There are several among us here who quote PFF when it is to their advantage and trash it when not, ... use it or don't, that's your business, but unless you watch NFL film of every player on every play, finding better sources may be difficult. There is a reason most media outlets quote PFF, the rest is up to you to discern on your own. jmo.