I don't like Boston, no scratch that I hate the damn jersey and everything attached to it.
That said Pierce shouldn't get shit for the team struggling. Rondo is not an easy back court guy to compliment based on the makeup of their current roster with teams having a whole camp and preseason to scout them, so there is no surprise like Bradley. Their win play is a mess as is their swing play as a whole. The fact is Terry, Barbosa, Lee all look damn good on paper, but it really doesn't look good between Rondo and Pierce with the way Boston plays. There is no floor balance so far, and the solution to that may be using Paul's weight in the triple threat area and on the block to draw defenders and then let those other three I mentioned shoot off of his draw and kicks from post ups and Rondo drives.
Allen isn't missed as much as the action and movement from double screens and pin downs he created to balance the floor so it couldn't be tilted by a D is severely lacking, sort of like how Chicago seemed night and day with Rip and Krover out last year or how Novak changes the Knicks dynamics
the Boston Celtics are easily played by sagging off Rondo and his lack of shot, as well as playing Pierce for the 3 ball and up close as Terry, Barbosa, and Lee aren't capable of putting it on the floor or running off screens the whole game, let alone posting up
just my take