The biggest point is that there are few apps optimized for Android tablets and even those optimized for Tegra 3 tablets run much smoother and faster on an Ipad. This guy shows them side by side and the difference is huge. Also, web browsing feels better on an Ipad because websites are often Ipad optimized and its better aspect ratio and smoother browser help too.
Of course the guy also said that Ipad 3 is less cool to use than the Ipad2, the UI is outdated and boring, that the notification system sucks etc. etc. Basically apart from apps and browsing Ipad is not too great..It's just that most people use tablets exactly for apps and web browsing and that's where the Ipad does much better.