54s - Did I let them draw out?

[Cumulonimbus]

PFR was LAGgy. Everybody else were typical Party fish. What do you guys think, considering I expected a flop raise from the PFR?

Party Poker 2/4 Hold'em (8 handed) converter

Preflop: Nimbus is BB with 5[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img]. CO posts a blind of $2. UTG posts a blind of $2. UTG+1 posts a blind of $3. MP1 posts a blind of $2. MP2 posts a blind of $2.
UTG (poster) checks, UTG+1 (poster) checks, MP1 (poster) checks, MP2 (poster) checks, <font color="#CC3333">CO (poster) raises</font>, <font color="#666666">1 fold</font>, SB calls, Nimbus calls, UTG folds, UTG+1 calls, MP1 calls, MP2 calls.

Flop: (13.50 SB) 6[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(6 players)</font>
SB checks, <font color="#CC3333">Nimbus bets</font>, UTG+1 calls, MP1 calls, MP2 calls, CO calls, SB calls.

Turn: (9.75 BB) 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(6 players)</font>
SB checks, <font color="#CC3333">Nimbus bets</font>, UTG+1 calls, MP1 calls, MP2 calls, CO calls, SB folds.

River: (14.75 BB) 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
Nimbus checks, UTG+1 checks, MP1 checks, MP2 checks, <font color="#CC3333">CO bets</font>, Nimbus calls, UTG+1 folds, MP1 calls, MP2 calls.

Final Pot: 18.75 BB