I'm enjoying the game a lot. I find using the right stick to aim into the background can be a bit of a pain. Sometimes it's just easier to press fire and let the guy do it himself. But I try for a lot of headshots. I'm a melee machine. I have 80 melee kills already, and I've only uncovered 34% of the map. So far I've had a few spots where I should have used the blue line on the map and ended up back tracking past the point I was supposed to go. I've been very happy with the game so far. It seems to be a good length for a $15 game.
Yeah, pretty much this -- the multiple planes things is annoying and a bit difficult to gauge. More annoying are 'fake' platforms, very often I have to flash the laser pointer/flashlight at a surface to see if it really exists on my plane or not.