This battery issue is significant. The thing is, everyone uses their phone differently. I see the Battery Discharger app. Shouldn't we all charge our phone up to 100% and run this so we can compare using the same test?
The best way to track power usage is to actually measure it .. Nokia has a very good utility that does that on their non-windows smartphones called Nokia Energy Profiler, it will be really nice if they can port it to WP. It can show you battery usage in .25/1s/5s intervals in real time.. both in mA and W. Its really useful because you can measure how much energy your phone requires for different tasks.. for example a regular phone call vs. a skype call over HSDPA/LTE, the music player, idle.. idle with skype on, idle with skype off.. endless information which is really useful.
I haven't run WP Bench yet but I have seen a dramatic improvement in battery life since running Battery Discharger. I'm not saying BD is the reason for the battery improvement, it could be coincidence, but it is much better now.