agreed, the berserker nerf completely wrecked the class variety in most games. not just because it killed his effectiveness, but also the co-op dynamic suffers when you make a class that does too well on his own. people used to claim that this was the zerk, I just believe they were ill-informed, and tw took them too seriously.
also agreed that it's not the sharp who is overpowered, just the m14. imo the way to go about fixing this is to lower the rof slightly, nothing more nothing less. SLIGHTLY, meaning a few milliseconds in between shots. I don't think there's anything wrong with the dps or headshot multi, or even the mag size. it's just too easy to spam, and get headshots in by luck, if you sweep it at headshot height.
the xbow I would not change at all, it's a powerful weapon of course but I see nothing wrong with weight/ammo/damage. someone mentioned lowering the default ammo count to 20, that's a pretty good idea. price is fine but selling/rebuying to refill is just too easy. if you can afford to buy many of them and refill 20 bolts, then there would be no problem. since carrying one as any class besides support means that all you have as backup are pistols and melee, either way you have to conserve ammo.