Halo 3 was my first and I loved it. The campaign I have to admit I didn't really understand as I jumped in the deep end buying the 3rd installment rather than the first too. I only really play Halo 3 online with friends if it didn't have that option I probably would have sold it by now.
Well everyone seems to rave about CoD4? Dont get me wrong its probably a wicked game but when I played it it made me feel really sick, like motion sickness. I haven't played it since