Well,
Everything runs through Pierce and Ray now - the team is very much a perimeter team now as they will not likely feed Powe/Perk on the inside more than 7-10 times per game - which is a mistake in my estimation.
The big man rotation of Perk/Powe/Davis have to play tough defense, rebound, and score enough to negate the contributions of their counterparts in order to make games a battle between Pierce/Ray/Rondo and whomever the other teams' stars are.
Pose/TA/House/Marbury will have to be huge off the bench - I see them playing as a unit and they need to produce 35-40 points a night IMO - The starters aren't going to be as productive because Rondo is offensively inconsistent and Pierce/Ray are still perimeter players.
Against tough defenses, Boston will have to get quality production from the bigs defensively because Pierce/Ray won't be going for 50 every game.
Rondo and Marbury are the X factors - if they play like stars, Boston has enough to win against anybody - if they are just hit-and-miss complementary guys, Boston is done in the ECF.
I do think that Orlando is beatable though - quality efforts and a superior bench make that a fun and competitive 7 game series, but Boston has enough bullets I believe.
VS. Cleveland - I can't project victory without a dominant interior player because Cleveland is so good defensively and have eliminated Ray Allen consistently.
The team still has serious fire-power though - they could find a new style with all their current guys - Powe has average 14/8 against Cleveland this year and Perkins has had good success as well
Bottom line: consistent production from PP/Ray/RR and the team can compete against anyone.