Before this gets out of hand:
The Marine player can jump.
He can also climb onto the top of low (up to 1.5m) objects. No idea why the guy previewing the game found otherwise.
And a more positive bit from page two:
QuoteThe game is truly shaping up to be a shining example of the FPS genre and with such great properties and characters (Xenomorphs and Predators) it's not at all surprising. Rebellion seems to be doing an awesome job.