$3 SnG Making a call on river with dangerous board

[Turlock]

PokerStars No-Limit Hold'em Tourney, Big Blind is t50 (9 handed)
Hero (t2210)
CO (t3010)
Button (t1395)
SB (t5)
BB (t2430)
UTG (t1465)
UTG+1 (t1275)
MP1 (t2635)
MP2 (t575)

Preflop: Hero is MP3 with 9[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, MP1 calls t50, MP2 calls t50, Hero calls t50, <font color="#666666">3 folds</font>, BB checks.

Flop: (t205) T[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, MP1 checks, <font color="#CC3333">MP2 bets t150</font>, Hero calls t150, BB folds, MP1 folds.

Turn: (t505) 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
MP2 checks, Hero checks.

River: (t505) 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MP2 bets t375 (All-In)</font>, Hero calls t375.

Final Pot: t1255

I know this is an easy fold against any normal opponent,but this guy had been quite crazy,is this a fold regardless of any read I might have?. Obviously you can tell from the post that I did call and was right,but I'm trying not to be results orientated.