[Nate tha' Great]

Chiming in late here but a couple of things:

1) In a weird way, I think that if the 3-bet is as bad as everyone says, then that makes the 4-bet on the turn pretty bad as well.

2) I also think this is a fairly straightforward raise on the flop, as the limper very likely will have a 3-5 out hand on this board, and the pot size is exactly such that he'd be correct to call for one bet but not for two.

...As for the river play for J282's opponent, the right play is almost cerainly to call the turn bet and to fold the river without improvement, hoping also once in a blue moon to get a free showdown.