Will you buy an RPG just by the fact that it is an RPG?
No, it depends what kidn of rpg and how it feels after some 'research' on internet or in a shop.
How do you decide to buy an RPG?reviews,word of mouth, forums?
Forum, word of mouth.
Do you cheat/ use hacks/editors?
No
Do you use walk throughs?
In general :no. But if I'm stuck, maybe, but I prefer to ask for hints on a forum.
Do you download the latest patch before you start a game?
If I know there's one, yes.
Do you prefer single character or party?
Single.
Do you prefer single player or multipalyer?
Single player.