We're obviously not yet to the start of the season, but it appears that the first of the dork polls as put their preseason rankings up. Duke sits at #10 on Bart Torvik's (aka KenPom but free) 2021-22 rankings:
https://barttorvik.com/?&conlimit=
Torvik predicts we'll have a top-10 (just barely) offense and a top-30 defense, with an overall adjusted efficiency margin of 19.3.
Of interest in the ACC:
UNC #21
Louisville #23
FSU #27
Notre Dame #29 (returning almost their entire rotation from last year)
Va Tech #46
Clemson #50
Syracuse #64
UVa #69 (he's REALLY not a fan of their offense, and thinks their defense will again be less than elite like last year)
NC State #74
Ga Tech #77 (losing Alvarado and Wright is a big loss)
Miami #86
Wake #102
BC #133
Pitt #157
In general, I think these are pretty spot on with the notable question mark of UVa. I agree with Torvik that they should be worse offensively (losing 3 unbelievably efficient frontcourt players and with little shooting coming in/returning), but dropping all the way to 162nd in offense feels a bit too steep for me.
I guess it comes down to how good Gardner and Franklin and Shedrick can be. But I feel like something more in the 50-100 range offensively makes more sense, which would probably push them back up into the top 30-50 (depending on whether the offense is closer to #50 or closer to #100).