It's possible to use OS X without locking any of your data into their horrible apps, I do it every day. That's a reason to switch away from Apple apps, not a reason to switch off of the platform.
Then again, if you don't use any of their apps, it's kind of a strike against the whole "it just works" thing that's supposed to be central to why one would use a Mac, don't you think?
the hardware just works. My computer never crashes. Ever. Sleep and hibernate work without any tweaking, which I don't think is possible on linux (IME with, literally, dozens of distros on laptops).
That's why I like my mac.
I think it's hard to come up with real examples of where Apple applications really hijack your data, and next to impossible to find examples where they made it harder to get to for no good reason.