I believe the OP is saying that the changes were not enough of an improvement to warrant the overhaul. Not that they weren't big changes.
I certainly hope that was the intent, but I read it as most other people seem to have: "Same-old, same-old."
Assuming it's a question of "improvements", I'd venture to say that it depends on what you're looking for from a game.
I've been pretty down on 3.5 for about a year, now. Recently, though, I had an epiphany. It isn't that 3.5 sucks. It's that it accomplishes things I don't want from a game (mainly, rewarding system mastery -- which is probably an odd thing for a 25+ year veteran of many systems and the appointed "rules master" in my group to find undesirable, but there you go).
I think 3e focused on certain (design) elements that had always been present in D&D, and let others slip to the wayside. 4e focuses on a largely different set of elements that, again, were always present. Both 3e and 4e, of course, added new elements into the mix, but I don't think that's really the source of the schism.
My bet is that, while many people can enjoy both, most will consider one to be clearly superior to the other. That will be based on what elements they enjoy most. I think the same is probably true of whether people think 4e "feels like" D&D.