The combat system is fun, but it really starts to get old because it lacks variety after a few hours, so Deadline Games should have added more depth in combos to keep the game play fresh.
They did add a nice array and variety in unlockables that adds to the playability of Watchmen as you play again and again to find everything in the game.
The co-op mode works well and is the best part, especially with a friend who has the same tastes, but there's no on line option for co-op, which should be an automatic inclusion in a game developed today.