Unlike some others I don't mind opening up with ATo here. It's been folded to you in late middle position and while I won't always raise ATo here I will do it often enough as I don't like just limping if no one has opened yet.

I like your entire line here and I hope you made the call at the end on the river. I think often enough you're going to see a worse two pair, missed flush draw, or even a hand like AK/AQ/AJ (would be a horrible bet by these aces but I've seen worse).

Yes he could show you QJ or a set(although I think a set would have raised already) but I think you take this down enough that this is actually an easy call instead of an easy fold. If you had led at the river and he raised you then I might fold, but often when I think they were on the flush draw I will check the river and let them bluff like this.