Simple fact is that, even compared to the new weapons, the old Crossbow is the most overpowered weapon, and the SharpShooter perk is all you need to beat the game with ease now. The SCAR really isn't that great in my opinion, granted it does have good damage, but it's nothing overpowering and it's main downfall lies in its ammo. SharpShooter(and SS weapons) on the other hand has no such weakness. With all the weapons they can carry and use, ammo is absolutely no problem and with their damage after what has been done to headshots now, the SharpShooter clearly reins supreme, far ahead of anything else in both teamwork and soloing ability.
The game has had some nice difficulty changes, I like what they've done to alot of things(clots, headshots, husk, and yes, I've noticed that the spawns seem more challenging now etc) but all those changes are cancelled out by how rediculous SharpShooter, or simply even the Crossbow in particular, have become.
All this is based on Suicidal gameplay. I mean come on, SharpShooters taking out Fleshpounds instantly in suicidal 6man games is just BEYOND rediculous.. absolutely lame. It's not even just that they can do it, it's how efficiently they can, for instance Demolitions can do alright in this area, but their ammo supply is much more limited, they can't solo well at all, and there are always chances that things can go extremely wrong. There is absolutely no downside to SharpShooter. Sit back, watch things die.