Adobe did get it right for millions of users of Lightroom 4. I have experienced no problems with ANY version of Lightroom that I have used. There is something obviously wrong with your installation, or a problem with your computer system that is preventing you from experiencing the same success that many others have. If you could take the time to give a few details, perhaps someone could help you. We need information such as:
Amount of RAM
Amount of free disk space
Make and model of the camera you are using
Any other details you can think of that might help us understand your system.
I, for one, have had every version of LightRoom since it first came out and have never, ever had a problem. I started out with Windows and only within the last few years, changed over to an iMac - 27 inch. The same goes for PS… no problem at all. Now I have Creative Cloud and a subscription for both.
LIGHTROOM 4 - RUBBISH OR WHAT?
No - obviously not.
Thanks for playing, though...