MPTK on a monotone flop

[DontRaisePlz]

PokerStars 2/4 Hold'em (10 handed) converter

Preflop: Hero is BB with 5[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#666666">3 folds</font>, MP1 calls, <font color="#666666">3 folds</font>, Button calls, <font color="#666666">1 fold</font>, Hero checks.

Flop: (3.50 SB) 5[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, MP1 folds, Button calls.

Turn: (2.75 BB) J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, Button calls.

River: (4.75 BB) J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets</font>, Hero calls.

Final Pot: 6.75 BB

He pretty much auto-called the turn and nothing else is worth noting. No reads.