The best ME dlc by far and quite possibly one of the best dlc pieces I have ever played. I had a smile on my face practically the whole time I played and had many laughs along the way. If you love Mass Effect and characters I highly recommend getting the citadel dlc.
I bleed Purple and Gold. http://imageflea.com/pics/1009/6p8ruwmv.gif
One of the best DLCs I've ever played, if not the best. There's a ton of content and fan service. You have to be a truly miserable human being not to smile while playing this, assuming you liked the series.