Currently in Halo, people running about in the battlefield with the sniper is a very rare occurance, In COD, snipers are used as assault rifles. In fact any game with a first person replay cam, snipers are not used as they were intended. A real time 3rd person killcam, like battlefield, would be a MUCH better option then the FP one.
Give Halo a COD killcam and smaller maps, now snipers are assault rifles..