I think he'd do great: he did great during an era when there were a lot more true big men, and I just don't see how today's power forwards could contend with his length, on offense and defense, or his bevy of post moves.
Again what pf are you talking about? Barkley and malone didn't really play him in their primes and id also contend that 1999 started a decade where power forwards dominated the league with arguably the top 3 of all time
Well, some of these guys may not have always played power forward, but I'm sure McHale took his turn matching up with them at different times: James Worthy, Ralph Sampson, Mychal Thompson, Buck Williams, Larry Nance, Kevin Willis, Otis Thorpe, Charles Oakley. Not all HOFers, but there's some quality players there. McHale wasn't the quickest guy, but I think his length would still drive guys mad.