Live 3/6 - How bad is this flop 3-bet?

[casinogosain]

Live 3/6 at Trump, IN. Very loose, very passive game. I'm the only person that has 3-bet anybody at all - and nobody has noticed. If they put one bet in the pot, they'll put in 4. MP in this hand is a friend of mine and is the only one capable of making good folds. He also knows I am the only one capable of folding hands.

Preflop:
UTG limps, UTG+2 limps, MP limps, I raise with JT[img]/images/graemlins/heart.gif[/img], Button calls, SB folds, BB calls, UTG/UTG+2/MP call.

Flop (14 SBs): 8[img]/images/graemlins/club.gif[/img]9[img]/images/graemlins/spade.gif[/img]5[img]/images/graemlins/heart.gif[/img]
SB checks, BB checks, UTG bets, UTG+2 calls, MP raises, I 3-bet, Button folds, everybody else calls.

Turn (16 BBs): 6[img]/images/graemlins/spade.gif[/img]
SB checks, BB checks, UTG checks, UTG+2 checks, MP checks, I check.

River (16 BBs): 7[img]/images/graemlins/diamond.gif[/img]
UTG groans loudly, SB checks, BB checks, UTG bets, UTG+2 calls, MP calls, I raise, everyone calls.

Final pot: 28 BBs

In retrospect, I don't know if I like the flop 3-bet. I managed to get the button to fold, which is all I was hoping for, but I really had no reason to think he would based on prior hands. After that, the turn check is pretty reasonable I think, as nobody is going to let me win this pot uncontested and my backdoor flush draw failed to materialize. Finally, the river raise is easy. Thoughts?

-Ash