I agree, for browsing the web and casual things there are not many differences and many people would go for a Macbook design and since Mac OS X is preinstalled they are fine with it. I don't see how someone coming from Windows 7 should be happy with MAC OS X though. Mac is more limited, there are more potential uses for Windows and anything you can do with Mac you can do with Windows
Limited - the problems start when you want to use your computer for something more than basic things. Games, business or IT software or many, many programs (especially professional) that are there for Windows that are not there for Mac OS X. And I mean about 80% of business solutions that I use, often popular programs. Computers are rarely only for browsing web and casual stuff anymore.
Weird solutions mean - if you're used to Windows and it's intuitive and simple for you Macs have these weird things that are done in a different way and don't feel simpler at all. You can say 'It takes adjusting', to me it's Apple trying too hard to do things in a different, weirder ways. Also often you don't have setting that are there on Windows. Can't precise any exactly, just the overall feel because it's been a long time since I last played with a Mac.