dunno man, boumsong, grygera, traoré, marco motta, lucio or andrade were way worse for juve, and these are just some defenders, and from the last 2 decades or so. if you consider non defenders, then weah or kean are levels below gatti from our current squad, they just play further up the field so their mistakes aren't as costly usually
that said, gatti is obviously way too error prone. he gifted a goal to lukaku, that was inexcusable