Highly playable, if flawed – Marathon 2: Durandal Review

Most of the achievements are bugged (level progression, for example). No multiplayer, and subsequently, no Forge support. Which means there's serious room for improvement, and potential for revenue for the developers. That said, it's still a great port of the full single player Marathon campaign. Absolutely worth it.
Review by greenstate on Marathon 2: Durandal.