I love it. Love it love it love it. I'm a big alien player, does it show? I think the marines just had it too cushy, and have gotten lazy.
In my opinion, old marines just had to follow waypoints, blast anything that moves, and build phase gates. Then take a nap while their base kills the enemy base and enemy players for them.
My only problem is still the observatory. I mean cmon, how many games have rines ever won WITHOUT an observatory? The obs's abilities are pretty much required just to survive this new game. A game without an obs is an easy alien win. I think it's become too central to the marine game, and I'd like it set back a little bit (just a LITTLE bit).