I don't really trust battery reviews unless there are hard numbers. "Battery life sucks" doesn't cut it but that is what 99% of reviewers will leave it at. Sucks compared to what? For a smartphone if I can leave the house in the morning with it fully charged and do whatever I want on it during the day and have to plug it up to charge when I get home that night...it has good battery life. Some people's opinions of "suck" is if they have to charge it more than once a week, or if the battery indicator gets low during the day (indicator is not a good tool to go by, I had a phone that drained in like a few hours to showing battery in the red but it wouldnt actually run out of battery for days).
The only review I've seen with an actual test of battery said that it didn't turn off until like 9.5 hours of continuously viewing HD video ran on a loop. That's amazing - and why they put battery life as a pro.
Bookmarks