I would say this game is just not for snipers proper and most people seem to like it that way. The majority of maps are basically boxing rings or mazes, and those that are bit more wide open are complained about and avoided because there's "not enough action". I think it's just the nature of this game.

The ability to set up your rifle to quick-scope makes it possible to use a sniper rifle effectively in this moshpit style fighting, but it also creates insta-death Golden Gun condition where you only have to see an enemy and he dies. This is totally unlike using a rocket or a shotgun. It's completely silly and unrealistic, but it's allowed for within the game's mechanics and in its defence, at least it makes the sniper rifles an option.

Unless you disabled the ability to quick-scope then there would continue to be no place for long maps, and people would just conintinue to hate on any map that wasn't a knifefight.

I would love for one or two dedicated sniper maps. I think it would be awesome if there was a massive BF3 style map that could only be sniped on. Even make it into a game mode. The idea would be something like this:

TDM - First team to 10,000 Points wins. However, scoring points for your team isn't based purely upon the +100 model per kill. You'd get the initial kill points, plus extra points per "meter" that your shot is, in addition to whether or not it's a headshot/vital shot, aswell as whether or not the person was sprinting. All of these would factor into the score (which means it wouldn't take forever on a huge map to reach the 10,000 point limit).

I don't see it ever happening however, but it would definitely be the only game mode I'd play I imagine, especially if the map was properly designed.