The hate that the Lost Planet franchise gets saddens me. I was a huge fan of the first, despite the single-player campaign being extremely difficult. I, too, experienced my share of "cheap" deaths, but it really came down to playing the game intelligently and well, a requirement that has been all but lost in modern-day games. Most games these days are designed to cater to the lowest-common-denominator, the difficulty balanced to provide a slight challenge at best for an experienced gamer. Personally, I play games to be challenged, and the feeling of satisfaction that results after overcoming a significant challenge is a large part of my enjoyment of the medium as a whole, and finding that these days is harder and harder.
Even so, I can understand reviewers being frustrated--being used to beating the vast majority of games with a modicum of effort and in a matter of ten or so hours, the game that comes along and makes you work more hours for the same pay is obviously going to stick in your craw.
The first LP was a tough game that required skillful play to do well, and I expect LP2 is the same. Keep in mind, though, that being bad at a game and a game being bad are not the same thing.
Looking at the reviews already up, the common complaint does seem to be that the single-player is too difficult with AI companions. Considering the game was designed to be played co-op, though, I'm not sure how much impact that complaint should have on the game's review score. Personally, I feel that a compelling co-op exerience and a compelling single-player experience are mutually exclusive. And don't cite GoW--the Gears games had a solid single-player experience, but the "co-op" experience wasn't very "co-op"--it was more like two people playing the same single-player game at the same time.
A truly co-op experience must feature interdependency--that is, my success is partly dependent on my teammates, and vice-versa. If a game is designed with that in mind, replacing human teammates with AI isn't going to work well.
It's a funny thing--Left 4 Dead has the same problem, but a big issue wasn't made of it. Maybe Capcom just needs to add more zombies, or maybe LP is just too dissimiliar from Halo and Call of Duty to deserve a fair shake.
Screw innovation! Can I has moar Haloz, plz?
*weeps*