It’s pretty fun and addictive. It also induces rage. The graphics settings are very scalable, I was able to run it on low-medium settings on the family PC at home which only has 2GB of ram and a single core Athlon 64 3200 processor.
It looks damn nice on my main PC though when everything’s turned up to maximum.
I did try out the level editor, I’d prefer to do more with it. My last attempt to do something with it unfortunately looked like an embarrassing mess of poorly moulded clay…