How are people getting on with this?
I absolutely love games like this (old school run-and-gun), but it took me a while to get into this one. I'm enjoying it, but for a 'shoot everything that moves' game it feels a bit cramped. Serious Sam and Painkiller both give you plenty of room to maneuver when taking down wave upon wave of mindless enemies, but here too many spaces seem just too cramped... given that virtually all the enemies move faster than you I would have liked more space in a few areas.
Also, the destructible environmental objects... they can be fun, and they add another small dimension to the gameplay, but at times they can be more of a hindrance than a help. I must have died more times from environmentals going off than from enemy fire, especially in the more cramped areas. I find myself destroying all explosives before I attempt do battle, which probably isn't what they were intended for.
Final niggle: No crouch! I can understand not including a crouch function in a game like this, but don't tease us with its absence! The number of times there is a big pack of nano behind a fence, and an easy 5ft gap under to it. But no - crouch you cannot! You have to find the long way around.
Anyway, I'm really enjoying the game now - anything with a giant stompy super-robot gets bonus points from me, and trapping enemies with grav grenades never gets old... It just feels like it hasn't been play tested so thoroughly. Which is a shame. Bring on Serious Sam 3 (after I've done a playthrough on insane!).