YouTube, BBC, Xvideos, Xhamster, Pornhub, Youporn, Dailymotion, Netflix...
It's always choppy over WiFi in London from experience as there's so much interference from the amount of WiFi networks around and contention from the overcrowding.
(for ref, I borrowed an iPad for a week and played with it).
Something that, magically, Manhattan, say, has managed to avoid.
Oh, and your experience is "borrowing an iPad for a week".
Borrowing something for a week is a good way to find out if it suits, which it didn't. The person I borrowed it from was one of the people above who have discarded it. I gave it back as I discovered that it could be harmful.
Better than marketing-spiel and 10 mins playing with one in the Apple Store.