You're definitely not alone, as many people on this forum think this is one of the best rosters in the NBA, turned mediocre by a single person, Stotts.
I think that people just want a simple answer--having to solve major structural issues with the roster is hard and means being far from a championship. Having one of the most talented rosters with just the worst coach in NBA history means you can win the title with one move.
This roster is massively flawed and not that talented. As it turns out, CJ was just playing over his head for a short time before his injury and has since shown he's a one-dimensional scorer who's pretty mediocre overall. Nurkic has talent in a vacuum, but his defensive strengths are mismatched for this era--you can pillory Stotts all you want for playing drop coverages, but he was protecting Nurkic--having Nurkic switch or even hedge would lead to equally terrible results and make Nurkic look inept. And those are, by far, Portland's two best players after Lillard. This is not a highly talented roster.
Let's not even get into Olshey rostering Melo "for the legacy." Maybe this team hemorrhages points because players like Melo had to play a bunch of minutes based on the roster construction. Maybe this team shouldn't have been 29th on defense based purely on personnel, but it should have been in the 20s.