Well I was an avid Gears player before Modern Warfare 2 came out and comparatively MW2 makes me much less angry.
Number 1 annoys me occasionally but I don't mind I just switch to either a class with cold blooded or take out the Chopper and move in with the game, usually meaning I get 1 maybe 2 deaths from air support maximum.
Again from my Gears experience camping has never really gotten to me, after playing game after game of entire 5 man teams hiding in a bunker with grenades planted on doors and shotguns around the corner one guy with a noobtube won't bother me, I can just sneak up on him and lob one right back.
Talk to any Gears player about number 3. They will laugh in your face and tell you that you have no idea what host advantage is. This has actually been tested against an enemy standing still, the host of the game has a much more powerful shotgun than everyone else and as the luxury of 1-shotting somebody with hit at ~20% more range; and even they don't get a 1 shot kill, they get more damage than the non-host. SO if you end up 1 on 1 against the host, you're doomed.
As for number 4, 1 hit anywhere on the body with a torque bow = death. Boomshot, you shoot near somebody, they're dead.
Yeah you Call of Duty players have got it easy.