Not COD and not Halo. they are just two different gamesplay styles. I preffer Halo, but play COD when my friends ask me to.
What is realistic? thats a funny question. Playing COD and engaging enemies in real life is like saying Forza 3 is realistic when you have never driven a real car.
People tend to beat these subjects to death. Its a matter of preferance. Halo not having ADS is what makes it Halo. COD is no more realistic than Halo, just different. If every FPS played like COD then we would have no real choice anymore. Having a choice is what makes being a gamer great.
I like H3 and Reach. I played both for a while. I found that Reach took me a while to get used to. but you cant play Reach like H3. It's different. When I take both games for what they are, I play them both well and have fun. I have no issues with AA on Reach, but I will say I never did like using the BR much in H3, I used the AR with much succsess. In Reach I use the DMR 90% of the time and do well. You just have to use a different skill set with a different weapon. Complaining cause the DMR isnt EXACTLY like the BR is rediculas.