I only liked a few songs in the PC Duke3D soundtrack. Really nice IMO are "Future Military Conquests" (E2L01), "233.778 Celsius" (E3L07) and "Alienz, Say Your Prayers" (E2L07, this one is by Bobby Prince). OK are "Stalker" (E1L01), "Gotham" (E3L06) and "Water World" (E1L04, again by Bobby Prince).
Most of the rest are pretty dull. I think you are spot on with your description - they lack energy.
I liked the Total Meltdown (PSX port) soundtrack much more. Mark Knight composed it, which included 11 remixes from the PC soundtrack (improving upon the originals in most cases) and 20 original tracks.
http://www.gamesounds.co.uk/me.html
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