He is very good from set pieces at both ends of the pitch and he is a calming influence. Where he is not so good is when he has someone with a bit of pace running at him; though to be fair you could say that of most defenders!
Yes that was a really, really bad blunder and on day another could have cost us points. On the EFC games I have seen this season though he would still certainly be in the top 4 of our best players. (along with our ex keeper, PM and MY).