AT is your classical reverse implied odds hand, and its difficult to play post flop, ie what do you want to hit on the flop an Ace? a Ten?
Even when you hit the miracle straight its difficult to get paid.
The other way to look at it is, with and without seeing a flop, with AT you can jam and you have blocker and then you dont have to worry about the postflop difficulty. So I rather jam AT and rather raise fold QK.