Well one or two things I like about this forum is the freedom to debate other games, that never happened in WoW officially for many years.
I like to be fair minded and objective though
For example in WoW I liked AV PvP as it was a sort of a half way house between PvP and PvE being 40/50 people each side as I remember, had great fun doing that, ditto Kara and some ICC boss fights
In Everquest I liked the concept of mentoring as it had the potential to open up the world to higher levels, plus the various big cities
In Vanguard crafting was great
I think Rift has taken good concepts from elsewhere and has/will use them, as all other games do/have - the difference here is on this forum we can talk about them