I also have not read any of the books. I understand that lots of different people write them and I was worried that I'd end up reading the crappy ones!
Yeah, it seems really hit or miss, though so far I've only read the ones that belong to my aunt (and the new movie one), so maybe she doesn't have great taste. Out of maybe ten that I've read so far, only three or four were what I would call pretty good or better. The others were.. alright. I read really fast though and am always looking for new material, so even the not so good ST books were worth picking up, for me.
I don't know that I'd buy
another ST novel without looking up lots of reviews first.
i'm a huge fan of the tos novels. sure, a lot are hit or miss but i've noticed that a lot of the really good authors have a handful of st titles under their belt. right now i'm reading the fate of the phoenix which is a follow up to the price of the phoenix. it's written by sondra marshak who only wrote those two and myrna culbreath who has written a slew of tos books.