First of all, you don't need to believe it's 4th in the world. It's totally ok to disagree. But no one should disagree that UCL is among top 20 in the world, that is a fact. Maybe not 4th but definitely top 20 in the world, if not top 15 in my opinion.
If you don't believe QS ranking which places UCL as 4th, then how about THES which places UCL as 17th in the world and ARWU which places UCL as 21st in the world?
Three huge world rankings and the results are: 4th, 17th, 21st place.
I have to laugh hard each time I read this "worshipping" of American unis. Such as "mightly American unis", LOL
. Where is this worshipping coming from? Is the U.S. paradise for those like you? LOL.
Zurich or St.Gallen are very good, no doubt. McGill i Canada the same. But besides that, the rest are American and UK unis in the top 20.
I think most people would agree that these are top 20 in the world, in no particular order.
Stanford, Oxford, Cambridge, Harvard, Princeton, Yale, LSE, Imperial, UCL, MIT, CalTech, Berkeley, Cornell, Zurich/St.Gallen, McGill, and the rest is maybe more "vague", but Brown, UCLA, Warwick and KCL are good candidates.
So this is basically 19-20 unis which most would agree are top 20 in the world. So UCL is maybe not 4th but definitely top 15-20 in the world, which THES and ARWU also confirm.
I haven't even mentioned European business schools, those would trash U.S. boys. Heck, U.S. don't even have pre-experience Master's, lol, only MBAs (with couple of exeptions of course) but they are nowhere near top European schools in this area. For MBA it's 50/50 U.S. vs Europe.