You can only remove 2 things and add 2 things. They can be anything weapons, perks, maps, gameplay, types of matches, etc.

I would remove martyrdom and the grenade launcher.

I would add a silenced sniper rifle and a match type that would have a large number of players, about 40 (20 on each team). I think that would really be a lot of fun.

I would remove eaves dropping(never use it) and the grenade launcher(hate it) and I would a sniper silencer and hardcore sabotage.

I would remove eaves drop and challanges (you could get what ever you want on your gun without headshot or kills.) i would add bigger maps and more players

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i would get rid of: maryrdom and the fact that a silencer and red dot can't be used together

i would add: a silencer option for the sniper rifles and more power to the sniper rifles (they should all be one shot one kill...except when shooting through walls)

i would get rid of:granade launchers and last stand(that annoyes me)
i would add:sileced snipers(optional) and get a 10 kill streak to call in dogs

Definately first I would remove Wet Work, that map is terrible. (campers paradise) Then I would get rid of the G3, what the hell is the point of that gun? (looks tuff, but is a single shot peice of garbage) Now for the adds! First I would add the ability to create your own room that anybody could join, with the maps, time limits, game type, and weapon selection that you wanted. (like on Socom: US Navy Seals) Then I would add the ability to vote a player out of the game. (how many of us would love to see that) TEAM KILLERS, AND RACISTS BEWARE!!

Remove: Juggernoob and Noobtube

Add: More Maps and some of the guns and sights from the single player campaign

I would get rid of the Noobtube and Martyrdom,

And add laser vision like a red laser, easier for no-scoping and i would also add the dogs idea for a 10-12 kill streak or something like that.

I would get rid of juggernaut and matyrdom

I would add HC HQ and a new kill streak event

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i would remove eaves drop(noone uses it) and cage match(just boosters and campers)
i would a HC for all gamemodes and bipods for lmgs and snipers