I'm up to my 3rd 50th level character. So far I have a cleric, mage and rogue. Haven't been able to get into my warrior yet.
The latest addition to the game is Ember Isle which is a very large and free expansion. I was bored with the level 50 end game, but they added several systems that let you expand and evolve your character beyond level 50. Overall, I really like the new expansion. The island has several "Onslaught" areas that must be defended by groups or also can be soloed. If an area is defended by many players, the invasion automatically boosts the onslaught to make it more challenging. Also the world events weave themselves into these areas which makes it kinda fun.
Now if they will add some more soloable dungeons....