I tried this out on my 53 Wizard. Did three runs for about 2.5 bars of experience with 15 minutes of effort. I'm sure it's awesome exp per hour but you have to cope with the mind-numbing repetitiveness factor. You'll hit 60 before the end of Hell anyway I believe, so any runs like these seem rather unnecessary, unless you're someone who meets the Act quota for Hell but not the level 50 part.
The first time I killed Azmodan I was grouped with a guy who skipped through all the cutscenes and dialog (even though I had asked him not too). So I was catapulted into Act IV without knowing what happened. I went back and did Azmodan again, and then realized how easy it was to farm him for XP. I needed 1 level to be 32, where my next weapon upgrade was waiting in the stash. It was around 50k xp per run at that level. Took me three runs.
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