First off, there seem to be several classes of disappointed people. For the purposes of this blog (and some long-time friends of mine who'll get the joke), I shall refer to those disappointed by several other names including: spinach-speaking lynch mobs, grumpies, and unhappies.
1. spinach-speaking lynch mobs (sslm's), aka, kde-4.0 = collosal fail, wtf were you thinking? And when they refer to "you", they mean both kde and fedora. kde, in that kde-4.0 should never have been released as anything but alpha or beta. fedora, in that why did we choose to include anything so bad? you all suck, suck, suck.
Well, we can all have a difference of opinion, and it's ok to agree to disagree sometimes.
2. grumpies, aka, Lovers of all things kde3. There seem to be some that are disappointed in kde4, mostly because it simply isn't kde3, ie, apparently anything other than an exact copy of kde3, feature for feature, config option for config option, is a disapointment.
Maybe your expectations were a little off. Maybe the marketing behind kde4 didn't get to you. Don't know what to tell ya, other than, if you truly love kde3 that much, that's fine. Stick with what you want and love. In fedora-land, that means sticking with Fedora 8. But, but "I want Fedora 9" you may say. well, can't have your cake and eat it too... can't please all people all of the time... and all that.
3. unhappies, aka not satisfied with the current state of things, but willing to put up with some short-term inconvenience for the long-term greater good.
Much of myself lives in this camp. Including kde 4.0, meant that we (fedora) can continue to get incrementally better kde4-wise (*cough* kde-4.1 *cough*) without waiting another 6-month release-cycle for f10. From a practical point of view, since kde3 (on f8) gets EOL'd earlier, it allows us to focus even more on making kde4 better, earlier.
Let me re-iterate that including kde 4.0 in fedora shouldn't have caught anyone by surprise. The Fedora KDE SIG develops, meets, makes decisions all transparently in the open, and strives to always invite more input, contribution, criticism, participation by our community. Now, if our efforts weren't publicized enough to land on your attention radar, I guess that's at least partially our fault. My apologies.
Any other good stuff folks should know about wrt all this, let us know, and we'll be happy to add to