We could definitely use the good version of Sully.
The one who could finish around 58-60% inside, shoot 40-45% on long twos (when the shot was appropriate), and occasionally step outside and hit a reasonable percentage on spot-up threes.
The one who would grab 7-8 boards a game, score 13-14 points, make some good passes, and play solid defense inside, albeit without any notable rim-protecting / shot-blocking skills.
Unfortunately, we never got that version of Sully for more than a couple months at a time, and even the mediocre version of Sully (jacking jumpers, getting blocked inside, looking totally gassed in the 4th quarter) couldn't stay healthy for a whole season.
I must say I was very disappointed with Sullinger by the end of his time here. I liked him a lot when he was drafted and felt he had what it took to be a valuable piece moving forward. Sadly he just couldn't get himself in the right condition and limit himself to an appropriate shot distribution.