1. The symbol you're referring to isn't an 'off' symbol, it's a power symbol, although I agree that it might cause some confusion. You're the first person I've seen mention it.
2. There isn't a system restore shortcut on the start menu by default.You access it via the all programs/accessories/system tools menu, just as you did in Windows XP.
3. Aero doesn't turn off when I maximise a window.
4. UAC irritates a lot of people, but it's there for a good reason, and it's easy to turn it off.