On my SSD sits 4 MMOs - WoW, SWTOR, LOTRO and Eve.
Lotro has always been the worse of the performers. The engine just cannot take the textures. For raids, in particular pvp raids the graphics get dropped down to minimum in order to reduce movement lag.
As a comparison the others are fine - have never had to change settings, even raids.
Best visuals for an MMO has to be The Secret World, with Eve a close second.