Yay, ANOTHER battery thread. There are hundreds of these already saying everything you'd like to know on the subject... which is, in a nutshell, that the usage and standby times are useless and all depend on how you're using the phone.
As mentioned, you could simply play music and get absurd times. Conversely, you could open up a GPS tracking program that requires data (ex. Waze), send it to the background, start playing Infinity Blade 2, and be lucky if you get a half hour.
It all depends on how you use the phone and there's no way for us or anyone else to know if you're getting good battery life based on just the Usage and Standby times.