Actually in the 3rd issue, battery life while suspended/stand-by is where Win 8 has the opportunity to make a design choice. Android seems to use some sort of "shallow" suspend, where I suspect processes are still running, and it's only mainly the screen (and wifi) that's off.
It might be a good design choice for Win 8 to opt for a "deep" suspend, which lets the slate recover in 3-5 seconds (as opposed to the 10 seconds for a cold boot) which while not instantaneous is pretty tolerable. If a "deep" suspend for Win 8 ARM devices means that the slates can go for 3 days without recharging, then that's basically on par with the iPad.
I am imagining a trade off of 3-5 seconds versus split second recovery from standby in order to get that long a battery life is the correct one to make. If MS stays true to its values, they might even want to offer a choice between deep vs. shallow standby - or, as has been suggested, go to shallow standby for the first X minutes, then automatically go into deep standby if not restored within that time. This is the best tradeoff, I'm thinking.