I'm a gigantic fan of the MGS series - I got hooked on MGS2, then I bought MGS2:S, then MGS:TS, and MGS3... and I know I'll buy MGS3:S to play online - that will waste away every second of free time I'll ever have.
Looking at the trailer for MGS4, I'm pretty excited - I don't know what yet to think about an older Snake, but the graphics are quite excellent. I've got faith it'll come out great - just need to start saving for that PS3 now