Perhaps you've already had this discussion, but I'd just like to say that I thought he had a good game regardless of his errors. They were so annoyingly rare, as well. I think he would've been able to clear that ball 99 out of 100 times. And the penalty decision was very dubious in my opinion. I've re-seen it a few times and to me it seems as if the Roma player is seeking Vidal's leg, not the other way around.
Anyway, a penalty was given, so it must go down as a second big error by Vidal.
But despite all this he fought like a beast and even contributed to our attacking flow, so I'm at least happy to see that he can pick himself up after such negative episodes. Overall, I think he was one of our better players.