@grendelsbayne - I think people are mistaking "fits in perfectly in tone to the point you don't notice" with "musical wallpaper" - USS Einstein isn't suggesting a sedate score, or an unmemorable one. John Williams and Howard Shore are memorable as hell, to people like us, who actually pay attention to film soundtracks. But to the general cinema going auidence, they are not intrusive or notacable - when say, the Imperial March kicks in, it fits the scene perfectly - when Giachinno is blasting his bombastic score over the Starfleet symbol at the start of 'Star Trek' it is really odd to me for some reason; it seemed odd in the cinema at the time, although I have taught myself to accept it - I don't think it was simply a lack of familiar lietmotifs or whatever - because I love Horner and Eidelman, and they are hardly referring back to TOS or TMP all the time.
Maybe it just comes down to taste, and Giachinno seems quite polarising in that regard. I don't know if it's that his style is so recognisably and permenantly associated with Lost, and it's psuedo mystical plot full of heartugging revelations accompanied by his misty-eyed score. Bear McReary's work too, is a bit too closely associated with BSG and Terminator: TSCC in my mind. It's almost like their music itself is 'mystical', where Star Trek's humanism is more restrained and empirical - so like when George Kirk dies, it's almost as if Giachinno' score is trying to tell us we should be feeling some kind of mystical reverance for the moment - where Horner would have just expressed the facts; like Spock's death conveyng the feeling of loneliness and loss as Kirk loses his best friend.
But I don't like framing things in terms of negatives, and what not to do, so constructive suggestions:
Brian Reitzell from Hannibal for something avant gard. Maybe Christopher Franke from Babylon 5. Or the guy from Mass Effect? Hell, why not just get a Japanese games composer like Nobuo Uematsu to give it a go?