Opening from SB with weak holding

[Jerk_Store]

Bellagio 15-30, Villain is a little to loose preflop, and pretty bad postflop, much worse postflop that preflop.

Hero opens from SB with Q [img]/images/graemlins/club.gif[/img]2 [img]/images/graemlins/diamond.gif[/img], Villain 3-bets, hero calls.

Flop Q [img]/images/graemlins/heart.gif[/img]7 [img]/images/graemlins/heart.gif[/img]4 [img]/images/graemlins/diamond.gif[/img]

Hero checks, Villain bets, hero raises, villain 3-bets, hero calls.

Turn 5 [img]/images/graemlins/spade.gif[/img]

Hero checks, Villain bets, Hero calls.

River 8 [img]/images/graemlins/heart.gif[/img]

Hero checks, Villain bets, hero calls.

My thinking throughout the hand:
Preflop - I realize this hand is pretty mediocre, but it is certainly close vs. a random and I think this opponent is folding some hands here. I prefer raising to try and take the lead in the hand. I would fold before open-completing, which may have been that best play. I'm obviously not folding once I get three bet.
Flop - Check raise is standard, when I get 3-bet I think I still am ahead of him enough to call down at his point.
Turn - nothing really interesting, still ahead enough to call down I think.
River - Horrible card, I call getting 9-1 thinking he may be betting this river with JJ-99 and AK, AJ, etc.

Comments on any street appreciated.