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Not including sandbox MMOs (completely different)
But GW2 kills all other MMOs that are themepark. It has story (so don't need SWTOR), it doesn't have boring fall asleep on the keyboard autoattack (so don't need WoW), it has unique races...no quest hubs...no double tracking to return a quest that is a continent away. No grinding military style raids that have leaders that scream at you (WoW)...and the most amazing cities in any MMO (RIFT cities are like camps, they are freakin tiny)
What is the point in playing any other themepark MMO? GW2 does all of it, and does it way better. The only reason one wouldn't like GW2, is because they are sandbox fans and are jaded they aren't getting any quality sandbox MMOs.
GW2 is a HUGE leap forward in themepark MMOs. Anyone still playing the old are like those who used bows and arrows, because they didn't want to advance to the gun age. They are trying to old back advancements to the technology, trying to ruin future MMOs that are themeparks.
Only MMO that can be better, is a very high quality sandbox MMO. And its only "better" if that style of MMO is your thing and not themeparks. Right now though, all sandbox MMOs (except EVE and even that sucks, but its best one out) are too low quality.
Future of MMOs goes to GW2 and a high quality sandbox MMO.