BlackBerry Enterprise Service (BES) has been pretty much broken despite the encryption too.
Nope, BES isn't broken at all. In fact, that was one of the main reasons why BlackBerry (formerly RIM) ran into trouble with the Indian government, as they wanted access to both BIS and BES.
Now that BB10 devices are no longer tied to BIS, it's possible that they are now harder to tap than the old devices. Also notice that the NSA was able to h4xx0r Merkel's Nokia handset ... but they weren't able to do the same to her BB Z10. Quite interesting...