There are several situtions where I would play JT.
As a rule, it may be better to fold unless they are suited. And, suited gives you the 23rd ranking on the EV Scale. So, immagine what unsuited is.
But, if in late position, and the blinds are low. And, you have a decent stack, I would make a small call hoping to hit something. But, down side of that is, you may hit just enought to get into trouble.
So, when you limp in (late position) Since you have to fold on a raise, have a mindset that this is a scouting expedition, and be prepaired to fold at the first sign of trouble.
Thats just me. Just many situations to make that call.
In taking my advise, remember I dont win very often. haha
Good luck, that is the way to improve your game. Throw out thoses hands and get oppinions. It can only help improve.