I put Lion on my MBP on day one and on my MP the next day. After two days I reverted the MP back to SL via Time Machine (worked great). I decided to work with Lion for a while on the laptop. Some of the swiping stuff was OK and FileVault 2 was much appreciated. As time went on I disabled, dumped or reskinned much of the Lion stuff I didn't like. In the end I just like SL much better so I did a SL fresh install.
I'm wondering if some of the difference between the Lion lovers and Lion haters is due to machine type and size. On a 24in monitor the lack of a usable Spaces, the worthlessness of full screen mode and the still ugly iCal and Address Book really ruined my computing experience.
On a small laptop much of that iOS small screen stuff might come in handy. It makes me think that SL is a fantastic OS designed for real, full-sized computers that could have used a few additional tools for those working on small screens.
On the other hand Lion is an OS designed for smaller screens that managed to ruin some of the full-screen tools and be less artistic and adult looking at the same time.