Right now on my 360, I'm going through Diablo 3. After I finish the Reaper of Souls chapter and mess around with Adventure Mode until I've gotten bored with it, I'm thinking about moving on to at least starting the Mass Effect Trilogy. Perhaps doing all three back-to-back-to-back, perhaps not.

Anyway, I have the collection with all three packaged in one container and from what I gather, this does not include DLC.

So my question to people here who've spent time with the series (Suskie, Zipp in particular have talked a lot about these games) is what DLC is most worth buying and what isn't worth it? Doesn't have to be any in-depth analysis, just a brief opinion on if each one is fun, adds to the story, etc. or if it feels like filler created just to pad play time. Since I'd drop money on the former, but not really on the latter.

Thanks in advance, any and all!