I'm sure this has been done to death already and from 1.6 to source. I recently played GO for the first time from the recommendation of a flatmate. Being a long term source player I have to say I think it's dreadful. It seems by trying to compete with Modern Warfare etc. through adding in graphics a features it has just really diminished that sooo pure and simple game play. The things that bothered me most were how slow the walking is, the extremely stupid spawning locations for deathmatch and the lack of ability to choose your sever. Custom servers are such good fun and a really important component from the original modding scene I think.