I just bought the cleaver and I have no problems getting kills with it, it feels alot a like flamberge. I one shot most things with it. I don't see any problems there.
Arguments such as this weapon is worse than that weapon don't make much sense, since weapons are supposed to be different, some are intended to be better than others.
Claymore is an oddity, it does not fit the general speed/reach pattern of all the other weapons. Shorter -> Faster, Longer -> Slower.