On second thought I should maybe have posted this in the WIP thread 
neat, it could use some angles and stuff, everything seems boxy with the exception of pipes/tubes and such. what it needs the most is some color in the lighting, all of it is white
Looks like a pretty good start! I would comment on essentially what Bic already said, some trims along the bottom and top of walls would help to make the hallways look less boxy and a more interesting lighting would help too.
Its looking pretty sweet for a wip 
can't wait to see it with some nice ambient lighting 
Pretty good insta, but as mentioned the lighting is pretty bland. Even though you're using D3 textures then actually doesn't look that D3'ish, kudos~
not good as ken20banks halflife1 levels but this is still amazing.
i'm not sure that's a fair comparison, regardless of engine. this looks very very good though. i think Doom3 maps are among my favorite. it's just the look of them.. maybe the textures and smooth lighting. i dunno. i just like them, and this one looks like it's going toward the top 5 or 10 percent.
I think your geometry is in pretty good, shape, actually. The lighting is the biggest hurdle yet to come, methinks, especially comparing this with your q4 map you showed - both show very competent shapes that could be greatly improved just with some more interesting lighting. Some ideas that instantly come to mind are some bright cool lights filling up the vertical areas and casting shadows down from those pipes with warmer smaller accent lights providing the lighting around the rims.
only comment I'll offer geometry-wise: it looks like that angled curve in between the downward staircases ends in a corner; I'd keep the (I assume) 45 but nudge it upward a few units so you've got at least 8-16 flat around the bend at the top... some thickness looks like it would help.
what happened to your hl2 project?
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