So how does it look in game:
More or less realistic? I've tended to shy away from OBGE since from what I've seen it mostly makes things look more "vaseliny" and unrealstic. I prefer a realistic, gritty and natural looking world myself.
Depends on which shaders you use and if you have HDR off. I recall you don't like bright, so worry not
Colormood really tones things down. SSAO makes things look like a marvel comic book or Borderlands. Godrays look good no matter what.
Then also what textures you use.
http://i361.photobucket.com/albums/oo54/psymon11b/Screenshots33.jpg
I forget which are in these but here are few more Nehrim shots
http://i361.photobucket.com/albums/oo54/psymon11b/Screenshots34.jpg
http://i361.photobucket.com/albums/oo54/psymon11b/Screenshots37.jpg
http://i361.photobucket.com/albums/oo54/psymon11b/Screenshots39.jpg
http://i361.photobucket.com/albums/oo54/psymon11b/Screenshots35.jpg
I can post more later with brighter, but right now going out.