I'll say that it's really hard to tell, for someone who just started, cuz, when you just started, everything sounds hot. I think that every producer goes through progression phases (I dont have a better word to describe it...) You get to a certain level after a couple of experimentations and you like... damn, I did that? And at that point in time, you'll think what you did is a banger... and then you learn new things and what you thought was a banger is just a regular beat...
I think that other people could be your best way to know if you got a hot track, but then again, if they dont like the style, they wont like the beat. For some people, the Laffy Taffy song is the shit... so, you know, tastes is something that's real personal...