I just wanted to say that I have no idea what any of you are talking about. 
God I hope not I hate when people don't stick to the ideologies they've held and believed in for years because of the all powerful persuasive PC.
If you've never had anyone profoundly influential in your life have an effect your beliefs, then I would assume that you're still quite young? There's nothing wrong with that. Personally, I've actually had quite an impact on what some of my closest friends believe about the world, and changed their minds about ideologies, and people have done the same for me (even people I wasn't close friends with.)
Stories in RPGs are being told on an economical timeline, so spending the years developing respect for someone you're close to can only, at best, be simulated across conversations that take up an hour or two, depending on how much content they can dedicate to the character. Within that economic timeframe, I believe BioWare has done a very good job of achieving that. I even think that was one of the stronger elements of DA 2. In DA:O, you could only profoundly influence a character you were very close to, that you had developed a relationship with that sustained the necessary elements to make influencing their ideologies plausible.
That's hardly "all powerful." An "all powerful persuasive PC" would snap their fingers and get what they want. Even dark side characters in KotOR/TOR have to put in more work than that.