I guess my main gripe is Apple essentially forcing you to have to use the Appstore to get a program on your device. If there were alternate, supported, methods for installing applications other than through the Appstore or iTunes I would agree that Apple could do whatever the fuck they want on their store.
I sold my iPad before the courts decided Apple couldn't stop Jailbreaking, so I don't know how things are going on that front but I dislike that being the only other avenue.
But part of this stems from my insistence that a tablet be essentially a portable computer. It is fair to compare Apple's iPad to Sony's PS3 if you wish but by doing so you no longer really place the iPad as a computer and instead liken it to a toy, and maybe that's correct but that's not how I want it. Of course this is opinion, Apple very well may be able to do whatever they want legally and perhaps this method will be preferred by most people, I dunno. That's just why I bailed out.
This is slightly unrelated to the topic but I'm so disappointed in the tablet market right now, you have the iPad which is pretty closed and probably more limited than any of the others but it's also the best to use for the things it does do well, you have Android which theoretically should be better than the iPad but isn't, I liken it's openness compared to Apple as, well, Bullshit, and then you have Windows 7 Tablets coming that are probably going to be super flexible but will probably be less effective and intuitive to use than Android tablets or the iPad. Ugh. It's so frustrating.