Am I doing something wrong or does it take for****ingever to level up?

What's a good game mode to level up quickly?
Ninja defusing is going to be a little more tricky this time around since it's harder to get a Ghillie suit. But it should be fun because I notice the bomb sites when you're defending are super close to where you spawn. Although I have noticed that some bomb sites are in the dumbest spots they could have put them in. so cool. Anyone have any tips and/or tricks when ninja defusing in this game? Also the amount of space your perk takes up is kinda cool. Though I seem to always be one slot short of all the perks I want.

Pete... They really done it this time with the Riot Shield. Although they made it the coolest it's ever been, they also made it the worst it's ever been. I'd rather use MW3's RS 1000000000x more than Ghosts. I mean COME ON you can get GOLD for your riot shield! You actually have to be almost touching the enemy for you to be able to hit them.

Also everyone uses the AK-12. There was one SnD game where actually everyone on my team was using it.
my 2 cents.