I hate counter picking though. 1. I feel like a tryhard. 2. I end up playing a hero I don't like as much. :( Personally I think TA is easier to deal with, and even if she does well... she stops doing well pretty quickly.
Another one that's annoying to deal with if played really well: Dazzle! Well-timed/placed Shallow Graves are game changers.
I don't mind those too much...I try to counterpick around them, though. Lots of good options. TA just blinks on you and blows you up. XD I think the most annoying is probably...an Invoker that's played REALLY well.