Watchmen: The End is Nigh Part 2 falls short of expectations in the gameplay category because the developers didn't add any different elements to the combat. This is something that should be expected in a followup game, especially when the game relies so heavily on combat in the first place.
The benefit to not making sweeping changes is that if you liked the controls of the first game, you'll like the controls of the second game. They're just as solid as ever. You'll still get about 4 or 5 hours of brawling fun that will entertain and satisfy fans of the series, even if it seems like more could have been done.