"Black Ops 2 rectified Assassin Pro with Ghost. Treyarch did the right thing by making it a perk for people to move around with. Treyarch always make games where we have to try our best to be rewarded, although the Target Finder was absolutely disgusting"
....this alone shows that there's no actual problem with Ghosts itself. It's your and your BO2-spoiled mindset that's the problem.
BO2 was extremely rewarding with the Scorestreak System with very little work or thought required.
The MSBS, even before the patch, was never OP. In fact, it was one of the least used ARs in the community and the patch pretty much killed any real use with it.
As mentioned, the Bulldog's damage to range ratio is pathetic. You have to be quite close in order to get OHKs, but at any sort of medium range, you're going to using A LOT of ammo to get just one kill, so the range is hardly ridiculous. Maybe if you tried playing on maps besides Free Fall or Strikezone, you'd notice a much greater difference.
In the end, a majority of this "discussion" is nothing more than you whining about things demanding changes to make things easier for you.