I believe the OP is trying to draw a comparison between kvetching from 3e to the same for 4e because they wish to imply the complaints are of the same character. That's franky, bunk. 3e was a really nice design, and even those who aren't fans overwhelming agree it was a significant and overall approvement. There are some AD&D and OD&D fans out there, but for the most part, they are fans of that edition, not haters of the new one.
4e is an entirely differenet situation. 3e had a really successful product lifespan. It had a lot of third party support as well. It brought many old D&D players back into the fold. While the various worlds were upset a little bit to make room, the old settings and old stories remained largely intact.
4e is not aimed at long-time 3e players who have fallen from the fold. It's designed to sell to everyone, young, old, currently playing 3e or not. It has a tall order to improve on 3.5, which was not only a good design, but benefits from the evolution from 3.0. It is very unlikely 4e will be as well refined right out of the starting gate. Old setting continuity is being tossed aside without a thought, and FR is being massively altered to remain D&D. All previous D&D novels will in the future be discontinuity. All old campaigns will be discontinuity.
Whether or not you are enthusiastic about 4e, I think it's pretty clear that a lot of 3.5 fans have understandable reasons to be annoyed with the new version, either because they weren't ready to upgrade or they aren't happy with the new direction. While AD&D 2e was languishing when 3e came out, 4e comes on the heels of a thriving 3e.
Oh... and by the way, 4e is being put out for business reasons as much as any other. It is a chance to sell new rulebooks. 3e came out because there just weren't going to be too many new AD&D fans.