I'm a Mac newbie, starting out cold with Lion - it was already installed on my brand new MacBook Pro I got the weekend before last. I have quite an extensive Windows background, 20 years now. But I will say this:
I LOVE Mac OS X Lion! It's solid, beautiful & intuitive, cohesive and powerful all wrapped up into one nice package. Can't say a bad thing about it. Mail did crash (disappear) on me once, but hasn't happened since so I'll chalk it up as a fluke for now.
Seems like some have problems with it when installing it over Snow Leopard, but this certainly isn't my case. Dunno why some of you don't like Mission Control, with the integration of Expose & Spaces, but I think it's slick! Love the Finder & Spotlight - both something that seem tacked on to Windows Vista/7--Apple had this stuff pre-Vista! So glad to have a Unix terminal back within regular reach! Launchpad is great not only for beginner users but also seems to be efficient for veterans. Love that Apple balances out the OS for both newbies (LaunchPad) and veterans (Terminal). Would love to have native NTFS integration, but I get why that seems to not be possible. Noticed that Mac OS X doesn't have a native DLNA server, or am I missing something about that?
I'm very excited to join the Mac platform from ground zero with Lion. I'd even venture to say that I could even sit a Mac in front of my mom and she'd get off the ground wonderfully with it.