The offensive productivity of an NBA team is often be measured by defined indicators of efficiency and effectiveness. How many corner threes do they take and make? How many shots do they attempt and convert at the rim? How about free throws? These three categories yield the highest value per shot with the best success rates for the given value.
If you want to understand the offensive woes of the Portland Trail Blazers, take a look at where they rank in each of those categories.
As you can see the Blazers reside in the league basement at the corner-three positions, worst in the league from the left corner.