WvW was losely based of DAOC's RvR. ESO isn't loosely based it's a straight up copy. More importantly, this sieging,zerg warfare style of the game was a HORRIBLE fit for GW2's "Role-less" classes. Unlike in DAOC there's no tactics in GW2 that can't be boiled down to "Have more DPS than the other side." It also had the same problem WAR had, which is that if you were getting your ass kicked you just went into a different zone,which lead to endless zone hoping as the zergs shifted.
ESO plays much closer to DAOC, with dedicated roles, Anyone can stealth, a vastly larger single fighting area, longer tearms for "scoring" (the campaigns last months instead of GW2s weeks), and much better mechanism for population balance.