I will give Ubuntu all the credit that it deserves to make Linux more usable for ordinary users -- whether its giving great ease of use via Software Center or making it easier to install proprietary drivers, thanks to Jockey. The point is Ubuntu has contributed heavily to the adoption of Linux in the mainstream user-base.
We have noticed some discomfort as Ubuntu introduced a new UI with Unity and now is working on HUD. Many users, including, me are rethinking our plans about deploying Ubuntu. Some have migrated to Linux Mint. I am totally fine with those who are migrating to Linux Mint (in the end its all Linux and there should be no dirty fight here). But, the fact that most users forget is, you don't have to quit Ubuntu even if you don't like Unity for a while or are worried about HUD.
I will strongly recommend Kubuntu for such users who want a stable, familiar interface which is backed by Canonical and based on Ubuntu.
Then there are other official derivatives of Ubuntu such as Lubuntu and Xubuntu which offer Gnome 2.x like interface. The greatest advantage one would get is that you can install Gnome apps on any of these Ubuntus.
It will be a great compliment if Ubuntu announces a derivative based on Gnome Shell as Unity is now heading in a completely different direction and has very little in common with Gnome Shell 3.
So, this is my suggestion to all unhappy Unity users -- go ahead and download Kubuntu. Give it a try on live CD and you won't look back.
The reason I suggest using official Ubuntu derivatives such as Kubuntu/Lubuntu is that Canonical is invested a lot of time and resource in making Linux more acceptable for home users. They don't charge us a dime. The only way for us to contribute is by supporting the company. There is no harm in disagreeing with some of their decisions. And just because you disagree with some decisions doesn't mean you hate them or should quit. The fact is the company already has so much to offer that one doesn't need to quit. We must compliment the company for that.
So, I repeat you don't have to quit Ubuntu to quit Unity.
Share your thoughts, but do try it first.