Yes, Gonzaga has beat a lot of good teams in the tournament. Apparently more than anyone recently, save Michigan State. It's still pretty telling when you can't win against a top 3 seed.
And sure, it took K and Duke a while to get over the hump. But 11 years vs 22 years and counting is a huge difference. And Few has really been on that coaching staff for 30+ years.
So, what is it, a top 3-seed against Utah? Or top 10 KenPom wins against West Virginia and USC? Either way, they've clearly beaten a 3 seed, no matter how you define it.
And obviously Duke and Gonzaga aren't the same programs. Pre-1999, Gonzaga had exactly 0 zero tournament wins. Coach K had been a top 3 seed 8 times before winning it all... Mark Few just hit his 8th time as a top 3 seed. So really not that far off.
I don't think Few will ever catch K in titles, but if he can sustain this type of success, he should have a title eventually. I just know championships aren't easy to come by. We were a 1 seed 8 times in a 9 year span (98-06), and only came away with one ship. Gonzaga has only been a 1 seed four times in program history.