Detroit now has a beastly front line, but almost no perimeter game from it. Smith is the worst shooter in the league. Last year, Monroe hit a hair over 30% of his non-layups, which is Josh Smith-ish shooting, as he tried to adjust to playing with another big. He made around 40% of his non-layups the year before.
Drummond made only one shot outside of 10 feet last season, and was 15-50, 30%, from 3-10 feet. That gives the Pistons three guys who will eat up minutes and miss seven out of every ten shots that aren't layups or dunks. Maybe they will play a prison style of basketball where they just throw the ball at the rim and go after the rebound.
Strange signing, which doesn't address need, unless Dumars thinks Smith can play the three full time despite his perimeter woes.