I'm going to guess that you have only seen Andre's last WWF run, when he was working though the excruciating pain that comes with latter years of acromegaly. The reality was that Andre was a very talented worker, who, in his younger years, could move quick, throw dropkicks, the whole nine. Andre was anything but pure shit.
The Godfather got by okay, and his character and mannerisms more than made up for his shortcomings in the ring. Not a bad worker by any means.
Steve Keirn was very good. Even when he was saddled with the Skinner gimmick he could still work a fine match
Oh, and Nailz. Never saw any of his work outside of the character, so I have no idea if he was that bad or if WWF wanted him to work that specific style.