Finished MSQ as well (SPOILERS):
Yes, it was the best expension ever.
Pretty good in all points, stories, musics, characters, world...
1.The final dungeon and the last battle are just perfect, epic, intense... I was really impressed, the design is made to show you everything of their apocalypse... and that was terrifying.
2. Yes, Zenos who is back... and more crazy than ever, I found it a little boring really, he was from the last expension.
3. At first, I wasn't liking Solus/Emet-Selch, but at the end... I'm just very sad for him, his burden blinded him. I think, I can understand him now, he just wanted to get back his world and his friends, his family... (like us)
At the beginning, I was thinking he was a guy who can not be tursted. But at the very end, when he was asking us to not forget, His face was just sad all along.
For once, for all of people I want to go back, I want him back. I want us to show the true of the "present" and how we'll keep his history. For the first time - even if we can't see him - I want him to live... He is a great character.
Please, make him back at some point.