KK multiway, how was this played?

I did not have any very good reads on any of them because I only played a few hands prior to this...

Was this played very stupid, or was it "ok"?

Party Poker 0.50/1 Hold'em (8 handed) FTR converter on zerodivide.cx

Preflop: Hero is CO with K[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img].
UTG calls, [UTG+1 raises, MP1 calls, 1 fold, Hero 3-bets, SB calls, 1 fold, UTG calls, UTG+1 calls, MP1 calls.

Flop: (16 SB) 5[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/heart.gif[/img] (6 players)
SB checks, UTG checks, UTG+1 bets, MP1 calls, Hero raises, SB folds, UTG calls, UTG+1 3-bets, MP1 calls, Hero caps, UTG calls, UTG+1 calls, MP1 calls.

Turn: (16 BB) 9[img]/images/graemlins/spade.gif[/img] (5 players)
UTG checks, UTG+1 bets, MP1 folds, Hero raises, UTG folds, UTG+1 3-bets, Hero calls.

River: (22 BB) K[img]/images/graemlins/spade.gif[/img] (3 players)
UTG+1 bets, Hero raises, UTG+1 3-bets, Hero caps, UTG+1 calls.

Final Pot: 30 BB