Calling coach K overrated is not being objective. He's arguably the GOAT in college basketball and he's certainly been by far the best in the modern era.
Now, at one point in time I would have agreed with you about defense. But they won the ship last season because their defense during the tournament was outstanding.
Before the tourney started they were somewhere in the 60's of pomeroy's adjusted defensive efficiency rankings. Well below the previous low for a national champion. By the end of the tourney they were 12th. And his efficiency numbers are mostly an average across the whole season. So for 6 games their defense was good enough to raise their season average from 60+ to 12th.
Objective? Why would I be even remotely concerned about that with Puke and Rat Face? I'm more objective than their ad and recruiting agency.