Maybe I should also add that I don't have any qualms about stopping when I think something's in danger of jumping the shark, or disregarding garbage even if it's meant to be canon.
It doesn't bother me at all that there are 184 more Dragonlance books I haven't read. I think I've covered the important ones.
Also, there is no Highlander 2, no Star Wars prequel trilogy, and only one Dune novel.
I guess what I'm saying is that I'd stick to the good ones, and not get too concerned about completionism.
(I'd totally forgotten about Greyhawk until you mentioned it yesterday. I still can't remember any distinguishing features, if it had any. The Forgettable Realms.
)