Fav map:
Bioticslab \o/ It's been my favourite in all the mods and ofc in the retail.
Liked maps:
Office, I just miss the elevator
Wyre, I used to dislike it quite a lot the first times I played it, but now I realise that it's a masterpiece
Filthscross, It's really beautiful and very intense
Strangev12, short but plenty of fun (couldn't find the map on the forum, but I know that vortex made it, ask him^^)
Oldetower, Fantastic map, unfortunately Pix disappeared before ending it for the retail, but the first 9 waves are superb.
Hive, And I can't stop my list before naming Hive even though it had it's best days in the mod, I counted my plays and ~500 times, I loved the jump and every spawn, I love that there were no mindless zed-throwing.
Less liked maps:
Defence, I like the concept and the map itself (no I don't think it's unfair in anyway, since I haven't seen anyone use any exploit or similar) but it's been played too many times, and many more.
Waterworks, I can't put my finger on it but there's something that makes me dislike it a lot, maybe I'll come to like it in a month or so.
Penumbra, Same goes for penumbra, But I know the source to my dislike, in the mod I played on a kinda bad laptop, and I always had like 10 fps in that map.
Farm, This map is way to open, the few times I play it I fight from inside of some house due to the fact that I don't like the openness of the map.