Jez,
I can't see why it would need "serious" work but definately touch it up a bit. No need to be critical I've yet to see a map where I didn't think the lighting needed some work but Damage's map is far from bad. I agree with Yokai that the textures also need some work. Look forward to seeing more.
P.S. What's with the casino machines? Does it fit somehow? (not familiar with the location)