Indeed they can, but to be quite frank a sniper is only ever outgunned at their intended range if they are comprehensively outplayed.
-The AR user HAS to burst fire at them, and it will require 3-4 bursts to drop the sniper. This allows the sniper ample time to get their backside behind cover, or even squeeze off the one properly-placed shot they require.
-The AR user is unlikely to be rocking the kind of zoom level that the sniper is, making target acquisition much harder.
All in all, its going to take the AR user much more time to drop the sniper at sniper range than the other way around. This means either A) the AR user got the drop on the sniper somehow or B) the sniper was truly truly horrible. I really dont think that your statement has any validity to it whatsoever, sorry.
It does have effective counters. The trophy system. As for removing it from competitive play, maybe that has to do with the fact that they don't want people using it and spamming nades at objectives. Have you ever played WAW competitively? All they seemed to do was sit in corners and throw nades at the flags in domination with Fireworks and so they could keep knocking people off the flags. How does that take skill? It doesn't that is why Danger Close isn't in competitive play.
So in other words the remington is just as bad as the honey badger and the AK? So then they are all the same and balanced in other words. Assault Rifles are suppose to work in situations that are close quarters to long range. They are the do it all weapons class in all cod's. Just as they should be. I see nothing wrong with it.