You want overrated, how about Shag O'Neil. Nice to be a 7 foot center playing a foot from the basket.
Shaq was slightly overrated, but nowhere close to the most overrated ever. What made Shaq overrated, imo was that he was lazy and that kept him from fulfilling his full potential.
He liked to call himself The MDE (Most Dominant Ever), but he never really lived up to that. With as dominant as he could be (and to an extent, was in his prime), if he would have had even half the work ethic of guys like Kobe or MJ, he would have easily been the MDE and probably would have made a serious run at MJ for GOAT.