Another vote for Darksiders. Despite it's best efforts to come across as being completely generic, it's an extremely well polished and enjoyable game. Played it through on 360, currently going through it again on pc, possibly my favourite game from this year.
My anticipation for GoW3 was very high based on how much I liked the first two. It's more than competent, though the impact was reduced due to the game largely sticking to the tried and trusted formula. It's still one of the leading games in it's genre, there just happens to be quite a few games over the past couple years that have closed the gap.
If you're looking to get as similar to GoW3 as possible your best bet is probably any from Dante's Inferno, Bayonetta, Ninja Gaiden or DMC.