That's why you have melee to support you and give you enough time to reload lots of times. Or position yourself on the roof. You can easily avoid melee until you're the last man standing. And even then you are able to use that 1h. Also for the MW sniper kill chance of 50% - nonsense. Learn to pick your targets and you'll get enough kills before you get melee'd. MW sniper has buttloads of damage and it should kill pretty much anyone not in plate, with a body shot.
Oh as long as we are talking teamwork, then I think that the german great sword is a very OP weapon! I mean, it stabs really far and if you have a group of melee or ranged supporting you, you can do really well with it!
Dude, most weapons work really well with team work. The thing is, you're team isn't there to bail you out plenty of times. Even then, if you're the last man standing, you may get off two shots before the enemy is on you. You'll be lucky if you ever load another bolt in the chamber that round; especially if you're using a simple 1 hander. As far as the bow killing most people in one hit out of plate, that's absolute tripe and you know it. I've been working with bows for months now and unless i'm shooting peasants, 1 hit shots don't happen very often. It also happens even less with the nonmasterworked weapons (yeah, I actually aim for high priority targets, rather than peasants, I suggest you try it rather than presumably shoot low levels and make hasty generalizations as a result.) Anyway, my point behind that is that the Sniper bows certainly aren't OP per say. They do suffer from a problem all xbows suffer from, too little wpf required to have decent accuracy with them.