Howard's offensive game always looks limited against Boston because Perkins does a great job keeping him from getting great low post position. Any low post player, even Hakeem, is much more limited when they can't get position. It's why Yao and Perkins always give Dwight problems, because he cannot consistently get post position down low on them.
Instead of constantly mocking Howard's post game, give your players credit. He has no problems scoring on a guy like Duncan, so obviously he has some offense. Push anyone out of their comfort spot and they'll struggle. The Celtics do a great job on Howard, it doesn't mean his offense is non-existant.
There is no denying Perk's excellent D. He is a beast and an excellent defender. That said, against Perk or lesser defenders Howard's moves are not good to say the least. At some point he has to learn some post moves and face up moves, let alone a 12 foot, at the least, shot. As I said, Perkins came into the league incredibly rough as an offensive player but he has worked and developed an excellent post game, great footwork, the baby hook and a solid 12 foot shot. Players like Hakeem, Ewing, McHale, etc knew when faced with a strong defensive player who wouldn't give them position they had to use a face-up game, develop their range, have the threat out to 15 feet of a jump shot be not simply a scoring option but used to enable them to work their way down to the block or into the lane.
Ewing coaches Howard but Dwight has apparantly not learned from Patrick. Look at Ewing, he developed an outstanding 15-17 foot face up shot over the course of his career that made him amazingly difficult to defend. Howard succeeds offensively when he can out muscle a defender. It takes a lot more than that to be a true force. He needs to work on his footwork first and foremost, develop an up and under, a face up game, etc.
I never tried to slight Perk. He always defends well. It is what you can do when faced with a great defender that sets you apart, and what we can see is that Howard can't do anything in that scenario.