ok i get around 10k to 14k exp a game with operative but doesnt it defeat the purpose when you take my light speed when im disguised and make me run like a medium?

Good news! The game is making your disguise even MORE convincing for you!

This. If I see a medium or heavy jumping off of walls, I'd be quick to gun him down.

I agree, What is the point of disguising as a heavy if you run like a light, That is basically instantly saying. "Hey look at me! I'm not actually a heavy!"
Besides, I actually think the operative class is pretty weak, They don't have any really especially useful abilities that I have seen. The sticky grenade and caltrop both svck.
Stickies can be pulled off by anyone, caltrops can be easily walked over by just using iron sights and walking over them.
Disguises are also pretty easy to remove and you can't do much with them. It would be nice if they gave you like a critical hit melee bonus if you melee and enemy and while disguised.
But nope. On a side note, Anyone know of any forums that might be of help for the brinkmanship achievement?

I find it to be more useful if you're on the offensive team.

For example, Container City.
At the start of the match, when your team is trying to blow the wall.... Open up the side passage, then go back to the main gate and find a body to decoy with.

People generally don't notice or have problems with "their" people coming in from that side passage, though there's no logical reason a defender would be coming from that passage anyways.
You suddenly have instant access to all of their command posts.

Any time there's a deliver objective, passing off as a "defender" is WAY too easy. I've walked in front of three enemies while decoyed, gotten behind the objective, and then when I see an opening (usually when they are all occupied with shooting), grab the objective from under their nose and make a dash for it.

Operatives are a bit over-powered in my opinion, but only if you take the time to anolyze grunt psychology.
And only if you're playing non-COD mode.

I guess I'll humor OP by saying it would be a nice function if we could have a button where we could switch movement speed on and off. It's kinda annoying being super fast and then super fat at the press of an I-phone app. Being able to switch movement would be nice for getting into position, then penetrating enemy lines.

XD I'd like this app. Tell SD to release it for I-phone so I can infiltrate random buildings.

I'd prefer to have the option, but if it has to be one or the other, forcing me to drop my speed for a more convincing Disguise seems like the better option.

seriously doubt that you get 10k-14k a game. especially with an operative. ima callin bs on this one.

I'm finding all the operative's skills useful. Whenever I take a disguise I use it to get behind enemy lines to hack turrets or to get to command posts. Sticky grenade plus sprinting grenade makes for a nice ambush and it's usually easy to get out.

In terms of xp, homing beacon is on par with medic xp, also caltrop grenade has been really effective for me.