Lots of runs/series get collected, but not many are collected well.
Like are all the key issues included?
If multiple series are involved in the run or stories, are they put in the proper reading order?
Are the Volumes all the same size and look? So that they look great on a shelf.
Personal preference here, but are all the covers included, so you can see how they looked when they were in the stores years ago?
Are they only avail in TPB, HC or only in giant Omnibusses (Omnibi? Omnibuss'ss?)
What is your nomination for the best collected run of a writer/series/character that is collected REALLY WELL?