Sounds like day 1 salty tears to me. It takes time to learn the maps, lanes, perks, equipment, movement options, etc... How all of that stuff factors into your play style and how the community plays. You can't play the beta for a few days and have shit figured out. Especially if you haven't played COD in a while.
Complaining about drop-shotting is pretty sad. If someone can drop shot you, you would have died anyway. Campers? Oh my god, am I sick of people complaining about campers. Use tactics. Holy shit. You know where this dude is, flush him out with nades, your specialist weapon, scorestreak, etc... you have more tools than ever now. In time you learn the hiding spots and know to look out for them by flashing before running through a door or around a corner, pre-firing corners, etc..
The same thing happens every COD. People become babies because they can't adapt to people playing better than them.
It's like people yearning for the days of MW. You don't miss the good old days, you miss playing a game that had more people inexperienced with FPS playing that are easier to kill because it just got crazy popular.
MW2 still had it 
