Sadly it did go downhill for me once you hit 50 on the first character.
When I get online and think I have to level and gear other classes just one thing comes to my mind, and that is: man, I have to wait 1 hour to complete an instance on most of these classes to get them some gear and do it over 50 times...
Or when I start leveling up mining, I literally get this face:
I know these issues could be fixed, it's not just the content, it is simply how dull and repetitive everything is, leveling up as well as gearing up. No challenge on instances, it is pretty much a "oh well we gotta kill them to get to kill the boss then leave... let's do it", kind of dungeons.