Is this too weak for blind defense?

[Rounder 24/7]

Villian had raised the last 4/4 hands from this position.

Cryptologic 2.00/4.00 Hold'em <font color="#0000FF">(6 handed)</font> link

Preflop: Hero is SB with 5[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Button raises</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#666666">1 folds</font>, Button calls.

Flop: (7.00 SB) K[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">Button raises</font>, Hero calls.

Turn: (5.50 BB) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets</font>, Hero calls.

River: (7.50 BB) 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">Button raises</font>, Hero calls.

Final Pot: 11.50 BB.