$5 +.50 UB Loose opponent

[zPro]

Still Early 15/30 Level.
Opponent has made loose calls.

Ultimate Bet No-Limit Hold'em Tourney, Big Blind is t30 (9 handed) FTR converter on zerodivide.cx

SB (t1350)
BB (t2095)
UTG (t3570)
UTG+1 (t445)
MP1 (t1495)
MP2 (t1465)
Hero (t1525)
CO (t1645)
Button (t1410)

Preflop: Hero is MP3 with Q[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img].
UTG calls t30, <font color="#666666">1 fold</font>, MP1 calls t30, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to t150</font>, <font color="#666666">4 folds</font>, UTG calls t120, MP1 folds.

Flop: (t375) 6[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG bets t375</font>, <font color="#CC3333">Hero Raises All-in</font>

How bad is this?
The more I think about this, the more I hate it.
Is calling the obvious play?