Played it, and it's true, plays kinda like Halo with smaller jumping and nectar instead of the shield. I don't know if it'll have the same level of sophistication with the vehicles and weapons, but it's definitely worth buying to me. If nothing else, it has the same timesplitter/goldeneye type "fun-ness", but then again that could be because I just played it a little tipsy and that makes every game fun.
