Eh, I'm on Warrior mode and its not that bad but people have said that it gets really cheap on the harder difficulties.
I find the Rocket guys ridiculous though, especially because they don't have to reload, and they just keep on shooting. The best way to deal with this game is to play cheap, which I find disappointing. One of the main reasons I loved NG1 was that it wasn't cheap, and you could always find a way to get better without playing cheaply.