LtFerret said:
do yourself a favor and skip Resistance 2
The campaign was pretty bad and the mutiplayer was dead when I last tried it.
If we're talking about the campaign in Hard mode, then I disagree. The scrimmages can be challenging, the towering behemoths can be a pain if you have no idea how to best them, and even the most basic, unarmed chimera can take you out with a few hits. It makes you think about a way to survive each encounter and this makes the game more engaging than simply jumping into the fray, guns blazing. It also forces you to search the area for hidden and useful weapons that will aid you in a future battle, if you know how to use it properly and tactfully.
I personally enjoyed it and was the primary reason I got Resistance 3, which the campaign is much better, by the way.