In reply to bennycattrall:
As a general rule I'd try to avoid setting routes that are vastly too hard for you. I try not to set stuff that I can't at least do all the moves on with a little work. I'm not sure I'd feel comfortable setting an 8a for instance.
Trick routes with really obscure or outlandish sequences don't seem to be that popular, but often work well as boulder problems. Bat hangs and things look great but most people simply won't try them on lead and the average wall user won't spot them
Another thing to think about is making the route fit a broad range of climbers. Having a crucial knee bar designed for hobbits or NBA players won't win you any friends, can you splay the volumes to give a wide size range?
Routes with huge traverses and big swings are often great fun but not if the wall is crowded, as an example there is a lovely features only rising traverse at the end of Swindon wall; probably the nicest route I've done there but you can only do it when the wall is dead because it wipes out half a dozen rope lines!