No of course you're allowed to. But bear in mind the people that read it.
Like I said, imagine how you'd feel if everyone at your work got the chance to post on the Internet just how well they thought you did your job. Imagine that some of them say you're shit and you should be sacked because you don't give 100%. Even if you disagree with them, it'll still make you feel a bit shit, angry and pissed off.
It's a fair comment.
But... No one here's saying he's shit. I think the most negative thing that anyone's said is that he's having a dip in form compared to last season, where he was absolutely class.
I can't be bothered to trawl through the entire message board, but where has anyone said anything of the sort that he's 'shit' and needs to be gotten rid of?
One mag on a wind-up maybe. But he's got an excuse.