3 bets to AQs in the SB

[SA125]

Played a long $20-40 session in Borgata today, had this hand early in the day and couldn't get it out of my head. Still wondering about it, ran some ranges on pokerstove and wonder what the consensus is here.

There's 1 EMP limper could have anything. MP, who's been playing quiet and tight, raises. Another mostly tight player in the CO, but who's been doing a lot of raising lately, 3 bets. Folded to you in the SB with AQs. Is this such an easy and standard play, or player/pot dependent?