I just started in Craglorn about a week ago. I'm about 60% finished with Lower Craglorn, and I have to say that the quests are phenomenal, from an "enjoyment" perspective. I've done all but 3 delves, half of the major quests in Lower Craglorn, and a few dailies here and there. Every story I've done so far has been interesting. Every major boss fight has been challenging and felt great. It's even been really easy to find groups (for me anyways; NA DC PC).
I'm posting this because I wanted to say that, from everything I read on the forums from the time ESO:TU came out to when I hit V14, I was completely scared I would hate it. There have been some phasing issues here and there, but for the most part it all works like it should. It feels very replayable, much like the Undaunted Pledges. Everyone talked about how ZOS hasn't delivered real content yet and how Craglorn was a neat idea, but terribly executed.
But I've not experienced this at all. I would say this is, by far, my favorite zone.
Thanks, ZOS!