Calling station or pot justified?

[Xiphoid]

Party Poker 2/4 Hold'em (10 handed) converter

Preflop: Hero is UTG+1 with Q[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/diamond.gif[/img]. CO posts a blind of $2.
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">UTG+2 3-bets</font>, <font color="#666666">4 folds</font>, Button calls, SB calls, BB calls, Hero calls.

UTG+2 is 35% over 50 hands.

Flop: (16 SB) 6[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, BB checks, Hero checks, <font color="#CC3333">UTG+2 bets</font>, Button folds, SB folds, BB calls, Hero calls.

Back-door flush and straight and possibility or an A (though I could be beaten by AK or AA) hitting good enough to call here for one bet and closing the action?

Turn: (9.50 BB) J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, Hero checks, <font color="#CC3333">UTG+2 bets</font>, BB folds, Hero calls.

Flush is out of the question, but the straight possibility improved. Odds to call?

River: (11.50 BB) Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">UTG+2 bets</font>, Hero calls.

An easy call for me here.

Final Pot: 13.50 BB