I wish Kevin all the best after his recent health troubles, but I'm not a fan of his work. The use of horns and other orchestral instruments was utterly out of place in UT2003/4, the other composer's synth/bass music generally fitted much better. I don't think orchestral instruments sound at all organic, personally - they tend to be too strident and domineering.
Riepl's semi-orchestral style is a much better fit with the Aliens universe, but that failure to understand and capture the Unreal universe is a cause for concern.