Purely experimental shows would not fly with the anime-viewing audience, so where Sayonara Zetsubou Sensei succeeds is that it has a strong cast of characters to enchant and charm the audience into compliance.
One might say that Kafuka and friends comprise a Trojan Horse.
OGIUE MANIAX 
Every Shinbo show does this. Have you not seen Tsukuyomi ~Moon Phase~? Hidamari Sketch? That’s basically his MO. Experimental crap but hay girls make it watchable for normal people.
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Also, source material?
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