Well PSG have only been relevant in the last 5/6 years i'd say. Ancelotti took over that club in 2011 and if you look at their first team squad from when he took over its slightly above average at a push. Sure they had 2 or 3 decent players already at the club ( much like ourselves ), but the rest of the squad was average or slightly above average at best. Once he took over he added to those 2 / 3 decent players and brought in the likes of Thiago Motta, Thiago Silva, Marco Veratti, Ibrahimovic, Lavezzi, Lucus Moura and Beckham. Those other average first team squad players also improved under him and went on to have decent careers themselves.
Before him, PSG went through a spell of not winning anything for about 15 years. It was under him that PSG started to become the attraction they are today. I'm not saying that we'll become champions of England in his first season here or that we'll even win anything; i'm saying that when he took over at PSG, not many of the squad that were at the club when he arrived, if any, would make any team of his in the last 20 years either.
Carlo Ancelotti attracts big name players and he can also clearly identify a player of world class potential.
The concern over his appointment originates from jealous bellends who can't accept lil arl Everton FC are being ambitious and want to have a go. The same bellends who had hoped lil arl Everton FC stayed a no mark of a club, a wannabe attraction, the best of the rest.