am i a donk for the check here???

3/6 B+M game (tight/fairly aggressive table image)
table is as lush as they come... filled with lotto chasers, and weak/passive players...
UTG= loose/passive, will hunt down with A-x or any middle pair despite clear evidence he's beaten
UTG+1 is the ONLY semi-credible player at the table
MP2= loose/passive but nothing too out of line
button= is really one of the worst players i've seen in a while, seen him call 2 in MP/LP with 5-2s, and 8-4 off, then call down to river with bottom pair
... really was a beautiful table...

hero is in big blind with A [img]/images/graemlins/spade.gif[/img], 9 [img]/images/graemlins/spade.gif[/img]

pre flop:
UTG calls, UTG+1 calls, 1 fold, mp2 calls, 2 folds, button
calls, sb folds, hero checks

flop comes: 5 players (5 small bets)
A [img]/images/graemlins/diamond.gif[/img], 9 [img]/images/graemlins/club.gif[/img], 2 [img]/images/graemlins/heart.gif[/img]
-hero bets, utg folds, utg+1 calls, mp2 calls, button calls

turn comes: 5 [img]/images/graemlins/heart.gif[/img] 4 players(4.5 big bets)
-hero bets, UTG+1 calls, mp2 folds, button calls

river comes: 2 [img]/images/graemlins/spade.gif[/img] 3 players (7.5 big bets)
- hero checks, UTG+1 checks, button checks

is this a horrible river check???
any other ideas on how i could've played better???