Since the KenPom rankings started in the 2001-2002 season, the only team with a higher rating than the current Gonzaga team, is the 2015 Kentucky team. They have an All-American candidate in Williams-Goss, three big-men averaging double figures and shooting above 60% from the floor (Karnowski, Collins, and Williams), and several sharp-shooting guards in Melson, Perkins, and Mathews. This Gonzaga team is legit. As of today, I would probably pick them for the Final Four. But things can change in a couple weeks.
Also, Gonzaga is redshirting two freshman that were rated as 4-star recruits. Team is crazy deep and talented. Karnowski and Mathews are the only seniors on the team - needless to say, this team will be one of the top teams in 2018 as well.