The battery life is a bit worrisome, but I have a hunch it's the reviewers battery life is not accurate. If he reviewed the battery life based on his first day with the phone it's going to be much shorter than normal (while you spend a lot of power installing apps, testing stuff, etc). Also, I'm under the impression it takes the OS a few full charges of battery to 'learn' the battery and utilize it in the best way.
My 2 year old Samsung Focus, using the original battery, lasts at least a full day with moderate use. It's a smaller battery the OS differences shouldn't be that dramatic, so I expect at least a full day use out of the Lumia 920.
Actually when I bought my Samsung Focus, the battery lasted near 3 days with light to moderate use. Only after the WP7.5 OS upgrade did the battery life get reduced to about 1/3 (it was an overnight change).