it seems like I overestimated the intelligence in NB.
What really simple math is count the people that disagree... then subtract the one(literally) that agrees(OP himself), and that that as conclusion to base your assumptions on about the actual intelligence on here. Besides, really? After 22,5k posts here on NB, this makes you wonder?
OT: Let's assume you are not trolling, and let's say we give you a fair share of logic.
First of all, it was Lee infused with Kyuubi chakra, probably had his five gates on, and as Kakashi stated, it makes you five times stronger. So that Lee, in that one instant, was probably his highest peak he will ever attain. It kicked Madara in half, yes, got him off guard, most likely.
However, Madara was connected to the Juubi, immobilizing his fighting abilities, or at least his will to. In that instant Lee didn't beat Madara, if anything, his arrogance did that for him.
Next to that. Take a deep breath. Breath out. Breath in... Let everything slowly go from your mind, untill there's nothing left but a Edo-Madara. Then introduce a Lee, even with eight gates, even with Kyuubi chakra infused. Now let them fight. Don't forget to imagine the Flower world, don't forget the meteors, nor the Perfect Susanoo'...
ok?
Now tell me. What do you see, OP?