Is that a personal observation or are there stats to back that up?
Just quickly;
Round 27 - no errors, 1 penalty, in 42 minutes - 100 run metres and 50+ metres post contact.
Round 26 - no errors, 1 penalty, in 43 minutes - 90 run metres and 40 metres post contact.
Round 25 - no errors, no penalties, in 40 minutes - 74 run metres and 26 metres post contact.
Round 24 - no errors, 2 penalties, in 47 minutes - 59 run metres and 26 metres post contact (against the Panthers, where everyone's stats are down).
Round 23 - didn't play
Round 22 - no errors, no penalties, in 29 minutes - 57 run metres and 18 metres post contact.
Based on that, albeit small sample, he doesn't seem to me to make "constant errors" (zero in 5 games) or give away a lot of penalties (4 in 5 games).
For the minutes he plays he makes decent metres and his tackle efficiency is over 90% for the last 4 seasons, so not much of an issue there either.
Always a Bulldog