I'm one of the rare guys that played, and really enjoyed both Kane & Lynch games.
The first one has some great levels and set pieces. It may not have been a looker, but it managed to cram into its stages so many enemies at the same time, like on that bank stage, or the one at a nightclub, I personally found it very enjoyable and immersive. The later stages aren't as good, but still, I enjoyed the game.
The second game has a strange, unique style that reminded me of a cross between a HK action film, and a documentary. Quite unlike any other game around. A bit on the short side, but once again, very enjoyable.