I was one of the 1 store raters..
.. because after download, it immediately proceeded to tell me I couldn't install it on my machine (a boring, vanilla 1 year old 15" MacBook Pro. I'm generally rather impressed with what Apple offers, including OSX (before I used Windows and Linux as main platforms), but the App shop download showed the deficiencies in that approach:
1 - in the above case, where do I go for support? Apple had a link to "support" - which was their generic help page which listed all the products except, you guessed it, OSX Lion. Duh. Money back? Hahahahahaaahhahahahaa. Funny. Sorry, I'm digressing.
2 - recovery. I'm about to find out how that works, because I plan to use this new OS release as a chance to clean out the machine. I have presently no idea if I can download the Apps I paid for again. Heaven help them if I can't. I suspect there is some manifest associated with Apple ID that will allow this, but I don't know. Anyone?
There are a few more reasons, but this will do for now.
Having said all that, I got it to work after all. It installed an App in the dock whose main function was to tell me that I couldn't use it. Once I ignored that and started what it put into the Applications directory it worked. And I made some ISO files for when I rebuild the machine (one inn DVD, one on a USB stick because it's faster).
In summary, I think the 1 star was justified for the original "experience". However, as for the final product it rates 4 out of 5 because of the vastly simpler and improved security model. Not a full 5/5 because revising the scroll direction was stupid, as is the launchpad.. Still worth the money.