By 'unfinished' i mean its not even likely that it'll ever be finished, but believe it or not still worth reading. I know of only two mangas like that:
Even if one can't muster up the energy to read Priest, which would be understandable given its unholy combination of being incomplete and being huge, one should definitely read the available 17 chapters of C.A.T. (at least so that i no longer have to be alone in my mourning )
I was gonna say Detective Conan, but it's the same old shit almost every case.
Maybe I should mention HxH as well.
That's not the type of unfinished that he meant. You don't read Hunter.
Berserk of course. Glad I can find more manga that have such an issue.
And well there is a difference with manga that are on hiatus, which are probably getting finished, and manga that are likely to never be finished due to the huge amount of things that still have to be done in them. Of course there is no chance to cancel these epic manga.