I loved the tone of the old FASA game, but I was never much of a fan of the rules, and as others have said, they lost the plot entirely with their TNG stuff.
But, they produced some of the best Star Trek adventure modules ever, IMHO. It was also the first RPG I ever played, back when I first went to college back in 1988.
ICON probably had the best Trek character generation, with FASA coming in second.