I'm not meaning to insult you but it sounds like you don't like aiming in shooters or aren't very good at it, which is basically the most important element in a shooter. Also I'm not sure who you play GoW with but I can assure you at high levels of play GoW takes great skill in aiming, although admittedly less than games like Halo.
The reason people love Modern Warfare is because is it gives them a shooter with crazy action, a considerable skill gap allowing competitive play and it does this all in familiar settings with guns that actually exist so people can relate to the gameplay. I'm not a huge fan of the series but I understand why people love it.
The definitive evidence that video games turn people into mass murderers
