I'm guessing Britta gets better as the show goes on? It seems like Troy does too, judging by what I've seen of later episodes.
Here's how I'd rank them so far:
Pierce > Shirley > Abed > Annie > Troy > Chang > Jeff > Britta
If I were to put the dean on there, he'd probably be third or fourth. He's freaking hilarious.
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Hey, you ever coming back?
You kidding? I am Queens Boulevard.