I don't see why they should even be compared, as all three are completely different. I found FO3 completely awful and a shame to a wonderful series, try playing FO1 if you haven't before. Bethesda lost their way after Morrowind. WoW I've never even had a passing interest in, MMORPGs are not my thing.
If Divinity is to be compared to other games, it should be titles like the Ultima series or other isometric RPGs that share the same qualities.
