Same as Old but revamped graphics. Think of it like a Madden Game as in Serious Sam 2009 HD.
Now it is a bit buggy but if you a PC puriest you will understand very few pc games come out right on release. The game industry now releases pc games in a more ruff form and have the players find the problems. I guess its the nature of the PC industry now. This does make me warrant a little lower score because of this but its definitely not worth taking half the points away because of it like gamespot.
Overall Its a 9 point game but because of the bugs/patch waiting I have to give it a 8. You know your paying for a remake and on that point it is great. Price is a little high but well worth esp if this is your first run through Serious Sam.