I've only found one player on the 360. I ran around on Processor and was disappointed that it doesn't really look much like what we saw in the movie. No hive victims (as crappy as the models are for them we know they exist), a whole two alien eggs, and you can't go any lower than sub-level 2. Maybe it'll be better with players, I don't know.
Downloaded the new pack for free since I bought the Season pass months ago, and so far have only played some of the maps in offline mode to test them out... I must say that what I have seen looks good.
While I agree that it would have been awesome to play in the Queen's nest and the main human harvesting area, the Processor map is still a good map. It starts at a type of main garage and then goes down to level 1, sublevel 1 and sublevel 2. It has nice textures and is actually bigger than it appears to be at first. The garage is big and has plenty of areas to snipe as a Marine or to hide as a Xeno, but the lower levels are very claustrophobic and look very much like the movie to me.
Fury 161 is also awesome... has leadworks... some corpses of inmates here and there, plenty of dirt and many areas from the film.
I have yet to test Nostromo and Exodus but what I've seen in screenshots looks good. Btw.... could the Exodus map be part of the upcoming SP DLC? The premise looks kinda like that...