There is some information and quotes from the developers on the vanguard wiki.
If you have not come across it, then check it out via this link
http://wiki.silkyvenom.com/index.php/Main_Page
The berserker page also includes Taliskar’s quote about the possible omission of the class at launch.
I see your point about higher armor and them being able to take a good hit, it is just the way the developers talk, that makes me want to avoid the class. Just not my style of playing, I suppose.