Considering how much more power efficient mobile processors are now and how battery performance hasn't really improved over my phone, it shows what an utter disgrace bloatware is. Basically ruins phones. It also shows what a joke it is that Google hasn't yet implemented the main point behind rooting devices - to run software like Greenify and take control over what runs in the background.
Another thing that anyone can do to improve battery life is to not run the most bloated apps of them all - Facebook and Twitter. Rather use Swipe Pro for Facebook and Fenix for Twitter. As it happens they're also much better apps than the stock ones.