8. Booker T
Despite most of the WCW/ECW Alliance wrestlers being presented as heels/bad guys, Booker T was a solid fan favourite that got cheered on a regular basis. Many people wanted to see him succeed after being such a central figure in the Alliance, especially after his feud with The Rock.
Yet instead of being featured prominently at WrestleMania X8, Booker T was lost in the shuffle in a feud with Edge over a fictitious Japanese shampoo commercial. The premise of this match was as ridiculous as it was insulting to the wrestlers involved. Edge was very much a rising star and Booker T was competing in world-title-level matches less than one year prior.
Booker T wouldn’t score a victory at WrestleMania until two years afterwards, and that was in a throwaway tag team match that featured three other teams. This was a disappointing way of using a wrestler that many fans absolutely adored while he was on WWE programming.