I would not be so concerned about making the playoffs had they not signed Brand (too many negatives in that sentence.) Most of the team's core players will be better in 3 years than they are now, but Brand might not be. If the team wants to commit so much to Brand, they can't waste his prime years rebuilding.
On the flip side, Brand hasn't seemed close to how his was in his best years, and he may or may not get back to his peak after all of his injuries heal (achilles, hamstring, Shoulder.)
As for Iguodala- he is more valuable when he focuses less on scoring and more on creating/defending/rebounding. Same thing for Miller. Again, I wish they would structure the offense to better take advantage of Thad, Lou and Speights. Those guys are much more naturally gifted scorers. I guess they are considered to young to carry the load?