Too weak against unknown?
 

Party Poker 5/10 Hold'em (6 max, 6 handed) http://216.119.70.224/converter/hhconverter.pl

Preflop: Hero is SB with 2[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises</font>, BB calls.

Flop: (4 SB) 9[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">BB raises</font>, Hero calls.

Turn: (4 BB) 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">BB bets</font>, Hero folds.

Final Pot: 5 BB

Re: Too weak against unknown?
 

I'm more inclined to 3bet this if you think your hand is good, otherwise I'd fold it on the flop. Another line against a more aggressive opponent would just to call down from here, but without a read, I'd probably fold the flop.