You are right about the maps lending to shotguns. We are sort of stuck queueing into games and the map selection is forced on for us . In Quake people would vote maps, so after a while only the maps that the community wanted were played. This ended up being maps that had more open spaces. In this game we don't have the luxury of voting maps or making a custom game and selecting the map. I do think that the newer maps are not as shotgun friendly as the vanilla maps, with of course the exception being the maps that ended up in Combined Arms. Maybe Bungie thought the large maps would have beenn more popular which would lend itself to more Sniper play, guess we'll never know.