It's not that much about lenght, Neon, but how compressed. As far as length goes, I want diversity. Moore did wonders in 4 pages and I wouldn't add a single panel. The problem is that the new four parters feel like two parters. The splay pages, the constant absence of caption, little dialogue, etc., that's the problem.
Why is people just starting to notice the decompression problem?
I felt a bit of the crazy guy yelling that the ship is sinking during the first two months of the new 52. I noticed it with Brightest Day / JLGL, but I thought it was just the decadence of the weekly format, which had had a nice compression and pacing so far (at least 52 weeks, countdown and wednesday were ok in that specific sense)... When I saw it in the wave of first issues, I thught thee ws something very wrong going on, which I confirmed in the following moths. By #3 it was a sure thing for me.
Ironically, of all titles the one with a decent compression was OMAC, from Giffing and the man of the hour himself. It's fair to note that Wonder Woman, Action and most of the dark books were not that bad, although not as compressed as previous stories by the same writers. OMAC did a lot, but nowhere near Formerly Known or even G/DM's run on Booster.