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After many years of playing MMO's I have a hard time finding a better MMO game engine then Guild Wars 2, from the jumping to animations and over all performance, a very close second IMO has to be the Planetside 2 engine (Forgelight Engine), granted this is my opinion giving what I have experienced over the years as far as MMO game engines go.
The Warcraft Engine gets a third from me and was number one until PS2 & GW2 over took it, but a Dam good engine still.
My question is what do you think is the best MMO game engine you experienced so far and why?