Watching some videos for kothwaste, it looks like a great sniper map.
Really? It's small as shit and the only decent sniper spot is easily accessed if the other team is even breaking even in the fight for the middle.
The only time I could imagine a sniper being effective other than the odd kill is if your team has full control of the middle, then you can just take potshots at people coming through the lower entrance. You should really try some lobbies on the map, I think you're going need to get a good feel for where you can safely be based on the ebb and flow of map control.