ill take a stab at this...
bmw-forums/bimmerwerkz- i like the old days of the forum... Back when furious was a mod in the e36 section and helped me learn about bmws. I liked when i didnt know about the lounge... and my early lounge days before all the hating and teasing. I like how you can get pretty good diy/faqs out of there. I dont like the lack of F/I take and lack of m3 drivers
Bimmerforums-Love the classifieds and the tech help i can get in a fast amount of time. Like how a lot of the members are friendly outside of the lounge. Dont like some of the members in the lounge. Dont like how big the forum feels... seems like they might need more staff to give it a more of a community feel.
DTM Power- LOVE THE regional forums(for meets, its great) and classifieds. like the f/i knowledge that can be gained, along with track/suspension talk. DOnt like how every new member gets on and wants to be dados best friend and freaks out cause he is there.. hes just another dude with a sweet car haha
Maxpower- havent been there.
e46fanatics-sets up some good meets for the NW
impreza.net- suby forum. lots of tech articles/movies helpful but not a bimmer forum... anyways thats it for now