Sure a new employee is helpful, friendly, enthusiastic, eager, positive, etc.
It's only after he's been there a while.
And seen the egos, the lack of assistance, the infomation hoarders, the gossipers, the backstabbers, the work dumpers, the lazy ones, that he gets a real feel for the work environment.
And then it becomes an effort of how to handle the new environment.
You can do what I used to do, and that is to switch jobs every time you cross paths with some jackass.
Except that's bound to happen at every work place.
So the best bet is to do your job, ignore the morons and make the best of it.
And there you have it.