I'm playing it on a CRT HD and the aiming is spot-on. I mean, really, really good.
Anyways, I haven't had enough time with it to give it a definitive judgment, I can say for certain that I'm loving the shit outta it so far. Perhaps as I get farther into the game the stuttery framerate will be more of a problem, but so far I can't really complain about it so much, either I'm not noticing it or it really isn't that big of a problem. I dunno. My complaint about the graphics would be is that I'd like to see better dismemberment, but its not a bad looker by any means.
The scoring system is really nifty, I quite like it. I love the deliberately cheesy and actually pretty well done dialog and voice acting (its very funny and likely to make you temporarily more profane). And once again, maybe I'm just a lucky sumbitch, but holy shit, the control is fecking wonderful. The way the view moves over as you aim at edge of the screen is just so damn cool, and useful.
So yeah, based on my limited play time, so far, so good.