Same problems here (heavy lagspikes, esp. in Cursed Shore and other Orr areas). This however is only happening using my ISP connection directly (which might be related to my ISP using Level 3 Communications for its US peering).
Using a VPN Connection that uses Intelliquent for its US peering everything is working like a charm (no lag at all, ping 40-190 from Germany).
Due to this I suppose this could be a network related issue and not a server one…