Pocket 7's overpair hand

PokerStars 0.10/0.20 Hold'em (7 handed) FTR converter on zerodivide.cx

Preflop: Hero is UTG with 7[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/diamond.gif[/img].
<font color="#CC3333">Hero raises</font>, MP1 calls, MP2 calls, <font color="#666666">1 fold</font>, Button calls, SB calls, <font color="#666666">1 fold</font>.

Flop: (11 SB) 3[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, MP1 calls, MP2 calls, Button calls, SB folds.

Turn: (7.50 BB) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets</font>, MP1 calls, MP2 folds, Button calls.

River: (10.50 BB) T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, MP1 checks, Button checks.

Final Pot: 10.50 BB

I know the preflop raise is questionable. How bad is it? Nothing out of the ordinary read wise on any of these players. I'm mainly wondering if there is any conceivable way I could protect my hand on a flop like this, with absolutely no idea what my opponents hold. I bet out because I felt like a check raise was too risky and probably wouldn't fold anyone out anyway.

I'm also curious about the river. Does anyone think this is a value bet?

Thank you