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Every game so far has its faults, and most of them have more faults than good things about them sadly.
Imagine an MMORPG with best of all worlds:
Combat and movement fluidity of GW2
Combat at the level of TERA
Story as good as World of Warcraft (pre cataclysm)
Depth of game as deep as EVE
PvP at the level of original Guild Wars
Massive scale battle areas of Warhammer Online (or if GW2 had done WvW correctly)
Freedom of character customization from Aion
Crafting at the level Star Wars Galaxies (maybe a bit more streamlined?)
Housing of ArcheAge(?)
Cutscenes at the level of Blade & Soul
Vanity customization levels of GW2
Character progression of Age of Wushu
Dungeon and Raid experience of World of Warcraft (before the game started catering for casuals, pre Cataclysm/WotLK)
Exploration at the level of GW2 (not too much, not too little, but tons of variety)
I personally wouldnt mind having one giant game that monopolizes the entire of MMORPG industry by being so good that other games could not stand a chance in comparison to it.
Just think of all the great things of every game you loved put in to one game, but thats just my list so feel free to share your ideals