Two examples of things that is in GW2 that made me think 'Why hasnt this become standard in every MMO?':
An Eve-like market system with Buy Orders etc. Even on day 1 of the beta almost everything I looked at had some buy orders already. I'm sure I could play the market game all day alone (like I did for years in Eve).
Alts are automaticly invited into the guild. No more spamming the hard-working officers, or Secro (:P), for an invite for us altoholics! Also, your user name is included on the guild roster with alts! No more trying to remember 18 different names for the same person. Awesomes.