1. Some class storys are good, other are not. No story in this game can be compared to any other BW product, it is just not as good as those others games (well maybe DA2).
2. No, companions are crap storywise.
3. Compared to DA1, companions are not existent in this game.
4. Definitely not.
5. Combat is good for a SW game.
6. Face-roll easy, not worth to call this a "game". More like an interactive movie (but not as good as those games).