I can only talk for the EU servers but the situation on EU was completly predictable.
The EU has only 2 datacenter with 12 servers, US has 3 datacenter with 24 servers and JP has 3 Datacenter with 32 servers... what did people expect from this?
There is NO suprise that the EU servers get clogget like a toilet with ques over 10.000 people and the "real" release is even still to come.
They should have give EU a third datacenter ages ago but instead we are doomed to play the "wait till its over" game.