What's polished: Fast and mindless action, great weapons, larger maps
What needs polish: Some rough animations and AI glitches that should get polished out by release.
Serious Sam holds a special place in the minds and hearts of a lot of old school FPS gamers. Before regenerating health, overly complex plots, and cover we had Serious Sam who was out just running around and blowing stuff up without a care in the world (well other than basic survival). Times have changed a bit and Sam is now being brought back by Croteam.