I had the same thought. I thought Tommy Lee got off really easy in that. From what I know about him, which is based on things he himself has said, that was not an accurate portrayal. He knew what he was doing when he was cheating on his wife, etc. He wasn't this naive kid thrown into the spotlight.
I think part of the friendly portrayal is due to the four being producers. You can also tell that Heather Locklear signed off on it while others, like Pamela Anderson probably did not. I agree that these guys were textbook drugged up rockers with far too much fame and money for their own good.