Interesting Question... Catalyst did an admirably good job, as far as post-SR books go. I had been quite unimpressed with Fanpro, despite how well SR3 ended up turning out, they cut costs on production, and any of the Fanpro books turned out to be of quite poor quality.
That being said, WOTC has been doing quite a good job of balancing the issues of production costs VS profit with quality of product in most of their other ventures. I can imagine them continuing the good work in terms of actual product quality. On the other hand, D&D 4.0, in my opinion, is a blight upon the good record of D&D History. I have SOME forgiveness for the fact that any time a complete redesign is undertaken, there is the risk of complete garbage as the result... So I am holding out final judgement for a D&D 4.5, sometime in the not so distant future, to see if they rectify the terrible mistakes made in 4.0. Again, with respect for their actual product, the D&D 4.0 books themselves are probably the highest quality paper/binding that I have seen since D&D 1.0!!!!!