You have to respect Shaquille O'Neal for all he's done in the league, but you also have to take into account just how bitter and mean the future Hall of Famer can truly be.
He started out early by spurning the Orlando Magic for more money in Los Angeles, where he'd then take part in a highly publicized feud with Kobe Bryant and go as far as criticizing his teammate's troubled marriage. Of course, Bryant had a few verbal jabs as well, but O'Neal made it a personal issue when there didn't need to be one.
As a result of the feud, the Lakers ended up trading O'Neal to the Miami Heat for Brian Grant, Caron Butler, Lamar Odom and a few picks. Shaq made a few huge promises for the Heat faithful by guaranteeing a championship during his time there. He nearly made that wish come true in his first season, but a rib injury to Wade in the Conference Finals would lead to their eventual demise.
It wouldn't be until next year that the Heat would win a title. Dwyane Wade averaged 35 points per game and would win Finals MVP. While O'Neal only managed to average 13 points and nine boards per in the Finals, his presence alone was enough to attract attention in order to get easy scores for his superstar in the making teammate.
After that season, it got ugly in Miami. I'm talking Pamela Anderson without makeup ugly. I'm talking Nick Nolte's mugshot ugly. Seriously, the final years of O'Neal's tenure in Miami were about as watchable as these past few seasons of the "The Simpsons" because we knew how good it used to be when they had the right pieces.
The Heat would lose by 42 points in the season opener and would end up getting swept in the first round by the same team that delivered the beating on opening day. Wade's injuries were beginning to pile up, as he dealt with another injury-plagued season where he only participated in 40 games. He played in only 59 the year before.
He would get traded in the 2007-08 after 33 games. The Heat might have let O'Neal off the hook, but Shaq sure didn't do the same for his former organization. He would criticize the roster and would go as far as criticizing the Heat training staff. He essentially put the blame on them for the injuries he dealt with in Miami.
This is where we find O'Neal injuries questionable. In the 2007-08 season where he barely played and was posting up career lows, the team was in a tailspin, and he wanted out of Miami in order to not tarnish his image of being on a team that would eventually finish 15-67. He forced his way out, wasn't happy with Pat Riley's coaching and would start anew in Phoenix.
As far as criticizing the Heat training staff? This is the same training staff that is keeping Dwyane Wade on an NBA court. The 2009 scoring champion who came near to never being the same player again went through extensive hours of surgeries and training with the Heat staff between 2006 and 2008, and it paid off in dividends.
With Wade still playing excellent and O'Neal eventually faltering due to numerous injuries, it became hard to believe that Shaq's injuries were as serious as he claimed them to be. Of course, I don't know the guy or the specifics of the injury, so I'll leave that for you to decide.