My favorite characters are the swans so far. They've got a really cool gimmick, even if it makes popping out of corners to shoot impossible. The non-lethal guy is also pretty radical. I vastly prefer melee to guns, so I like his levels a lot, since he can't shoot.
Green jacket guy's missions are a fucking nightmare, especially the second one's first floor. The dude after him is even shittier. Fucking some asshole pops me with an uzi after I clear out most of the area. If I were smart I'd ditch the sword for a gun or something at that point, but whatever.
How the hell does dodgeroll work? Does it make you invincible, or what? I've not had a lot of success with it so far.
I'm not digging the level design - there are just too many open spaces and too many dudes with guns for me to get a good roll going. I really hate how using shift-look immediately pops your dude to the edge of the screen - it makes looking around really finnicky. Similarly annoying is how my cursor is limited to a little area around me - makes it harder to get lockons. Being unable to see far enough to spot enemies down the way before they aggro on my also kinda blows.
The music seems to be missing something. It's kinda ambient, not the pumping, driving stuff from HM1. That's kinda lame.
I think my favorite level so far was the Fans one where you can first use the Tiger mask - the second floor's super tight, and it's really easy to get a good roll going. The roof kinda sucks though... I was using the Zebra for that place, though, so I didn't have as much trouble as I might have had there.
Was someone asking about that one boss with green jacket? It's kindw weird, but he loses some of his ability to turn when he rushes you. It's kinda tough to give some concrete advice, unfortunately. Dodge him twice, and someone will toss you a weapon.