These sorts of issues plague all MMOs it is the nature of the internet sometimes.
A lot of things can happen on the internet to cause ping spikes, yes servers is one possibility but it is not the majority cause of most cases.
They need the tracert's and pathpings to fix what they can fix, and as happened in the past approached ISPs and Backbone providers to seek a solution.
Edited LInks to work
- Guild Wars 2
- league of Legends