($27) AA on a scary flop, too weak?

[taipan168]

Opp's stats are 24/9/1.0 over about 180 hands. Is this too weak with AA? I would have called a reasonable size bet on the river.

PokerStars No-Limit Hold'em Tourney, Big Blind is t100 (4 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button (t2105)
Hero (t5210)
BB (t3335)
UTG (t2850)

Preflop: Hero is SB with A, A.
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to t300</font>, BB calls t200.

Flop: (t600) K, Q, T <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets t400</font>, BB calls t400.

Turn: (t1400) Q <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">BB bets t300</font>, Hero calls t300.

River: (t2000) 7 <font color="#0000FF">(2 players)</font>
Hero checks, BB checks.