To give another perspective, since I liked the game:
It's a platformer with heavy character weight and momentum (similar to Prince of Persia, Blackthorne, Flashback/Out of this World, last year's PSN/XBLA War of the Worlds game, etc). The controls are fair, and it's pretty rare to involuntarily kill yourself, but you do need to be constantly aware of the controls and a big part of that genre of game involves understanding your character's movement.
Some sequences in the game, particularly near the end, require a level of precision and reflex you're unlikely to have at first so they play out a little as trial and error. The checkpointing is generally pretty generous so failure isn't really a problem, but if you don't like trial and error you may be annoyed.
The game has a bunch of collectibles and is designed for replays to minimize time and collect everything, and although there's no real sequence breaking, you can really really shave down your time with creative or tight play. I've got my game time well below an hour, since you can replay individual segments.
One problem with the game is that the pacing is a little weird. The first third of the game is sort of a 2D survive, avoid zombies, platform based game. Then the middle bit of the game introduces more puzzles and environmental obstacles and brings you underground. Then the last part of the game has more trial/error type sections and more heavily emphasizes combat. Your character is weak and combat is basically a stalling technique until you can traverse an area rather than a stand and fight situation.
There are problems with the game, it's not perfect, but many of the issues people have with it are more related to the fact that it's in a genre of game that's pretty uncommon and counterintuitive to a lot of people's expectations. I tend to like that genre, so maybe that's why it worked for me.