You're ignoring so much if you think Spurs was his only good game this season. And he made a mistake that let in a goal, every goalie has one. Tim Howard has had two awful one's season. Reina and van Der Sar have had two of the worst I've ever seen. How can you watch this game on right now and say he doesn't look too confident with corners and set pieces and corners when I can think of three times this half alone where he's made great plays coming out for balls? You obviously have not watched him enough, he continually makes spectacular saves, and he's done so for a while.
Haha, you give me shit for judging him on one match then you say that he's great with corners/crosses/set-pieces because he's done well in this match.
He has potential but still has a lot to prove.
The way he's played in this game is no different than any other ones.