Does it help at all? I find it useful especially when comparing different apps that do the same thing. Unfortunately, like amazon, ALL the apps tend to attract positive reviews, meaning that they all have a positive spin.
Having said that I have found lots os useful extra apps I didn't know existed on there.
TIP: click on the "tags" section and browse via tags. It can turn up some real gems.
Does iusethis help you choose your apps?