I also tried the beta over the weekend (PS4) and this was my biggest gripe - I was playing assualt so using a rocket launcher and it needed maybe about 5 direct hits to kill - I understand that a one hit kill for a standard weapon may be a bit of a challenge but the amount of damage I needed to kill seemed to be too much.
I guess the problem is you can spawn with a rocket launcher and a decent amount of ammo. It's a default gun, now, rather than a contested map pickup, so it has to be powered accordingly. Did you ever manage to get any of the "power weapons" you can pick up? I didn't, although I think I was on the wrong end of them a few times. Those are more parallel to the power of the rocket launcher in old Doom, maybe.
I didn't get on with the rocket launcher at all. Plasma rifle, lightning gun, and super shotgun for me.