I love Voyager's set design. It's the best of modern Trek IMO. It's sleek, functional, and practical--the kind of things one would expect in a long-range research vessel and not, say, a luxury cruise liner.
I have no love for this series at all, but the production design was very nice; colors were well-chosen, and I'd have loved to see the ship gradually fall apart over the 7 yr run, if they'd been creative and 'daring' enough to go that route.
On the other hand I hate the -D.