[Heron]

I think JJTT is well playable for one bet. A flopped top set is better than a flush draw (if you fill up there will sometimes be no low) and in case of a straight or an OESD the duplicated cards have defensive value because they make it less likely that someone else holds JT, too.

It's clear that you have to fold the flop but the raise on the turn is not much better IMO. You will almost certainly get nothing from the pot when either one of the flushes comes in or the board pairs (28/44) and you will have to split the pot when one of the low cards apart from diamonds and spades falls on the river (12/44). Only 4 (JT99) of 44 cards give you a chance to scoop. I hope I counted the outs right but you get the picture anyway.