Terrible Turn Coldcall?

[highlife]

Party Poker 10/20 Hold'em (10 max, 6 handed) converter

Preflop: Hero is CO with 9[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, UTG+2 calls, MP1 calls, MP2 calls, <font color="#666666">1 fold</font>, Hero calls, <font color="#666666">2 folds</font>, BB checks.

Flop: (5.50 SB) 5[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(5 players)</font>
BB checks, <font color="#CC3333">UTG+2 bets</font>, MP1 calls, MP2 calls, <font color="#CC3333">Hero raises</font>, BB calls, UTG+2 calls, MP1 calls, MP2 calls.

Turn: (7.75 BB) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
BB checks, UTG+2 checks, <font color="#CC3333">MP1 bets</font>, <font color="#CC3333">MP2 raises</font>, Hero calls, BB folds, UTG+2 folds, MP1 calls.

River: (13.75 BB) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
MP1 checks, <font color="#CC3333">MP2 bets</font>, Hero calls, MP1 calls.

Final Pot: 16.75 BB

Also, how debatable is the river call for one bet?