In the sense that they do not have a top 10, MVP caliber player on the team, yes.
I think it's fair to say that historically, teams that lack a MVP type talent, irrespective of their point margin and their regular season win totals, don't hold up as well against elite opponents in the playoffs.
The 2004 Pistons won a championship without an MVP type talent.
Billups was the best player on that team.
But that Billups led team went to the Finals twice.
That Pistons team had the right mix of players.
They had inside presence with the two Wallaces.
Billups, Rip Hamilton, and Tayshaun Prince took care of the scoring.
The Celts should model that team instead of the GSW model of Steph and Klay.
A Celtic team with a starting 5 of Kemba, Brown, Tatum, Gallinari, and Steven Adams will be similar to the talent level of that of the 2004 Pistons team.
Smart and Theis come off the bench.