Almost every mmo that releases nowadays (well for over 10 years now..) has boring endgame. It usually gets better, but it has to be good enough to attract the players that are leaving or already have left, which is hard. Wow is the only MMO for 10 years that had an enjoyable endgame at launch, on the other hand, it got boring after the first expansion....

I don't know why it takes so long time for developers to do dungeons.... Shouldn't really take that long, and while dungeons(including raids) shouldn't be all the endgame, it's a big part of it. Don't know what they are wasting all the years of development on.