I'm going to go with JD BOLDUC.
His debut was pretty well hyped, here was a famous star in the metal music scene, lacing up the boots and training to be a wrestler. To top it off, he was going to debut in CHW and had the attitude to fit! I was really hyped for JD Bolduc.
Man was I disappointed! I expected that he wouldn't be the greatest in ring performer, and he wasn't, but his character was pretty boring and one dimensional as well. CHW didn't know what to do with him and he ended up as pretty much another jobber.
Its like if the WWE suddenly signed James Hetfield from Metallica. You'd expect him to not be good in the ring, but you wouldn't expect him to open up shows jobbing to other wrestlers.
That's what I feel CHW did with JD Bolduc.