Will you buy an RPG just by the fact that it is an RPG?
No. It has to be interesting. I'll usually try the demo first.

How do you decide to buy an RPG?reviews,word of mouth, forums?
Usually demo. Or a magazine reveiw.

Do you cheat/ use hacks/editors?
No. Not unless I'm really bored and have already completed it.

Do you use walk throughs?
Only if I've been stuck for over a week.

Do you download the latest patch before you start a game?
Definately!

Do you prefer single character or party?
Single character. It makes me closer to them and I get a better feeling as I create them. Party based games tend to have less character development and more levelling-up.

Do you prefer single player or multipalyer?
Single-player. I don't have time for multiplayer, and it ends up being a hack-fest anyway.