Will you buy an RPG just by the fact that it is an RPG?

No. Diablo series is tagged as RPGs, and so is Dungeon Siege. That does not make them anything more than action games with stats and levels.

How do you decide to buy an RPG?reviews,word of mouth, forums?

I mostly buy them on a whim. This is how I picked up PS:T and DD.

Do you cheat/ use hacks/editors?

Yes, because there are occasions when bugs occur and some of your items go poof, or a quest is not solvable, etc.

Do you use walk throughs?

Only when I have to.

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

Yes.

Do you prefer single character or party?

Both have their appeals. Single character is a bit lonely, though, and a party offers more tactical creativity. (Bar Dungeon Siege, mind you. I've never played a more mindless piece of horse manure. Dungeon Sige makes Diablo 2 look good.)

Do you prefer single player or multipalyer?

I'm anti-social, and have stomached all the multiplayer I want to from things like EQ. Besides, I don't work well with other people.