SS2 will be amazing and will own Painkiller. I like painkiller and tis a good game but nothing compared to ss2. The serious engine 2 is impressive and can be easily applied to alot of games. The dudes over at croteam have put alot of work into the serious sam games and they hope it will become a classic and respected title/series of games. Also they love marketing Sam off and exhibiting him as the macho ass kicker he is.
I hope that once this game is released (which i will be most likely getting as I own the first two serious sams) that alot of developers will use the serious engine 2 in there games because it offers alot of freedom with environments and the serious macro scripts are amazing. END OF STORY.