I had fun with the game, beat it on Normal. However Solo Mode is an instant crash for me and the last two levels don't run well on my computer... Which is a little sad now that I think of it. :laugh:
Overall a fun game though.
You're not the only one with issues. I can run L4D2 fine, and since I'm an admin on a server, I'm always spawning a bunch of crap and my frame rate is still playable on max settings. However, in TF2, performance is crap, and in Alien Swarm, performance drops drastically during combat.