They miss the only qualified manger to replace Michael
Why they didn't pick Oscar?
He is the smarter and the only normal person in the office.
Didn't you just both answer your own question AND contradict yourself at the same time?
How is an anti-Michael going to be 'qualified' to replace Michael? It's like saying satan would be the perfect, most qualified replacement for The Christ. You are making no sense.
Oscar is an annoying, self-important, humorless douchebag, a pretentious snob-wannabe that thinks he's more valuable than anyone else. His face is ugly, his speaking voice is irritating, his tone is monotone, and he is the most BORING character besides Toby.
How the F would this guy ever replace Michael? He doesn't have Michael's expertise and experience, he doesn't have enough quirkiness, he has no personality to speak of, he doesn't have a big heart the way Michael does.
This guy is all brain and contempt, no warmth or humorous quirks.
Oscar would be the worst guy to replace anyone but some egotistical jerk who doesn't quite understand just how useless and annoying he is.
The only thing more annoying than Oscar is andy bernard.
I thought you were going to say Jim Carrey, because he did appear in one episode.
Replacing Michael Scott or Steven Carell is like replacing Charlie and Charlie Sheen in Two and a Half Men - it can't be done.
I think that Boromir (the OP) and avortac4 are talking about two different types of "replacement."
The OP appears to mean that Oscar would be the in-universe best choice (i.e., if Dunder Mifflin was a real company and the show's characters were its real-world employees). Much as I like Oscar as a (fictitious) person, I don't think he has either the relevant experience or the personality type to be a district manager -- not that the Scranton branch office is exactly teeming with good choices.
The response by avortac4 seems to be basically asking who would be the best "Michael clone" in terms of whether scripts would need to be altered and how the show's real-world audience would react, which is pretty nearly the opposite question. In this sense I agree that Michael is (mercifully) a unique (fictional) individual and therefore no plug-compatible replacement is possible.
I haven't yet gotten to that point on the DVDs, but my impression is that they picked a new manager from among the second-tier people, with some details of the show's dynamic changing accordingly -- just as would happen in a real-life company.