I'll be honest and say I loved it. I don't even have a favourite part because there are too many. It's now my favourite single player add-on for ME3.
I encourage anyone desiring more squad moments or who were left feeling unsatisfied with what
was there, to purchase it and have more time with all of your squadmates from ME2 and ME3 while enjoying the 4+ hours of gameplay and squad conversations.
There's hilarity, some LI moments, fun gameplay, and a beautiful finish. Now I'm not saying it was perfect by any means, but I think people who delve far too deeply into what they thought the Citadel DLC was trying to do (i.e

with his review here:
[link]) are people who fit into the category of forgetting to enjoy the smaller parts of a larger picture. He's a cool guy, I just think he's probably too smitten with his Marauder Shields head-canon storyline to enjoy everything after the disappointment with the ending, and kudos to him for that since I think most people were unhappy with how the ending lacked clarity without the extended cut.
Considering reviews like Koobs are far and few between, and the majority of the fan community actually loves the DLC thus far (you did good child, you did good); I think it's safe to say Bioware has at least tried to make up for what was most likely EA rushing them for the ending.
If you're going to download the DLC, you will need to accept the Citadel DLC as a stand-alone product. If you don't I can assure you it doesn't add much story-wise to the overall plot arc of ME3. It's more of a much needed diversion from the war, which is exactly what the squad would need.
Now I'm off to play it a third time. #love