There's always games that are close. Duke has certainly lost a few they could have won. But not "should have" won. I mention those two games because it wasn't so much on a team's performance or lack there of. One was an absurd, non-subjective type call to end the game, the other was Roy's total coaching collapse. That's not including the should be T2 and ejection on Allen's trip in Louisville.
Really, I'm just guessing where Duke is among all teams. I'm not going to count Duke's "should have won" losses, just like I'm not going to count Kentucky's "should have won" losses to Auburn, Tenn and OSU. Duke and Kentucky earned those losses for playing crappy and being young. I'm not excusing Kentucky bad games and saying "Yep, they're only a 3 loss team". No, those were bad performances.
So yes, Duke has 6 losses, they came out on top at the end and those wins should rightfully keep them in the run for one of the top seeds. But, gun to my head, if I had to rank the top25 of who I think the best teams are, in my mind, Duke has 8 losses .. maybe even 9 losses. Not 6.
I do think there's a good chance they turned the corner just like Kentucky has. They've definitely improved, but have they really improved enough to beat those 3 teams? I don't know. UofL? Yeah. I'm just waiting to see them play a game that isn't marred in some fashion.