This is an over-the-top shooter that's a throwback to the genre's roots which is unadulterated action game that's just, well, fun -- but technical issues mars the overall experience. Serious Sam: Siberian Mayhem can run well, even on a PC without the latest specs. Along with the impressive graphics and animation, it's enjoyable to see what weapons and tactics work best on various enemies. Speaking of which, many of the weapons have a secondary function, like zooming in for greater aim to tossing an explosive. There are special S.A.M. abilities, too, like slowing down time, which is a blast. The only thing crazier than the weapons are the alien monsters you'll fight against, with surprisingly smart A.I. that hides behind obstacles, evades gunfire, and works in groups to trap you. But the fun becomes frustrating for a few reasons. The first half of the game is more fun than the back half, as if all the good ideas were used up in the first three out of five chapters/areas. The level design is also inconsistent, since some levels are so vast and open-ended, you don't really know where to move to find cover, while in other instances, the (mostly indoor) stages lead you down a strict path. Even though the game was patched twice during the course of this review, some technical issues remained. While it ran smoothly (even on older gear) there were random freezes, crashes and some issues with saved game files that frequently lost game progress. Finding multiplayer matches weren't the easiest to do either, and required finding specific servers. Still, Serious Sam: Siberian Mayhem is a fun adult romp for fans of classic shooters. The silly one-liners, over-the-top weapons and special abilities, and variety of creatures will delight those looking to blow off some steam at the end of the day. But the issues, like level design and gameplay inconsistencies, aren't likely fixable in a software update.