Hmm. Let's get the obvious out of the way:
TMP
TUC
TWOK
Okay then. TMP represents the best work for the franchise that Goldsmith did; TWOK for Horner, and TUC is just a very solid, atmospheric score. For me, these stand in a league of their own compared to the rest of the film scores, and TMP above all.
TFF
FC-INS
TVH
GEN
TSFS
NEM
FC and INS are about the same to me because they're good, but Goldsmith is showing far less originality than he even did in TFF, which I think is easily his strongest Trek score after TMP. Thankfully both have some nice moments. TSFS suffers essentially the same problem, but it's moments aren't as nice. GEN and TVH, the sole film scores for the series from Rosenman and McCarthy, are decidedly unspectacular. Rosenman's fits TVH hand-in-glove - bland, happy, and forgettable, just like the movie. Yet, it still has far more verve and character than McCarthy's decidedly uninspired GEN score, the least satisfying original score in the series. So why do I rate NEM the last? Candidly, NEM is unreservedly phoning it in, recapitulating whole sequences from TMP and just adding a few stray additional themes - none of them, sadly, any good.
In conclusion, none of these are bad scores; but there are three ones which are top notch and the rest are, at best good, at worst derivative and/or mediocre.