I have done a small amount of clubbing in london most when i was early 20's
but went to fabric last feb to see daniel avery, there a lot of negative comments around about the door staff/search but i found it no worse than other searches i have had, i was on my own as my wife was flat out in the hotel after an afternoon out and about but didn't encounter any ne'er do wells, mostly seemed friendly although i do think it is more student'y on a friday night from what i have heard.
Only negative was my own stupidity tbh, rooting in my pocket for some chewy and pulled out a little bag, 2 seconds later had a torch shined in my face and marched upstairs to ''the office'' ! didnt get kicked out which was a surprise and back onto the dance floor for another hour, good club, need to go again.