Found this review on ActiveXbox.com ...
For those of you who may not have seen or played Serious Sam on the PC, let me give you a bit of background into the character and the game itself. If you can think back to the good old days of Doom when there used to be loads and loads of enemies attacking you all at once, well this is the kind of game you are going to get here. Constant barrages of very imaginative creatures going after poor old Sam.
The Xbox version of Serious Sam comes with both Serious Sam versions one and two combined. So there are a heck of a lot of levels for you all to play through (over 30 in all). Serious Sam is all about pure fun, it doesn"t try to take itself seriously either, despite it"s title...The first group of levels in Serious Sam are based in Egypt. You come across all kinds of nasties from guys with bombs on their hands and heads to dog like skeletons who charge after you. The second main area is Babylon and medieval Europe
Graphically Serious Sam is surprisingly good. The textures used in the game have come across well to our TV screens from the Pc version, they look great from a distance and pretty good even when close up. The main thing that Serious Sam does really well is to have a massive number of enemies on the screen at one time, upwards of 10 creatures can be coming at you all at once and there is never any slow down at all.