Origins is a top 3 game of all time for me. Not dissing it at all. I would still easily say it's the best Dragon Age game by a long shot. I just have my preferences and like a character who is named by others (Shepard, Geralt) instead of being nameless by NPC's (Warden, Inquisitor).
People like Alistair, Loghain, and Duncan have their back stories, and the fun of playing one of them would simply be the RPG element we all love. We decide how they react, who they help, etc. Mass Effect did this beautifully, and is why it is my favorite game and series of all time.
Some players don't like that though. One of the reasons some people dislike Hawke and the Inquisitor is they are more realized characters than the HoF who is literally a blank slate, to the point they don't even speak. We don't see the face, to gauge responses to dialogue, situations (usually, the blank mannikin stare in nearly every scene where you do see the face was downright creepy). With the HoF, players got to completely build their character up in their heads with the information they gleaned in the Origin making it personal.
This isn't the same experience with a character like Alistair or Geralt since they have a set story arc and limits player options.
Mass Effect has a solitary hero (Shepard) who I think of more like Hawke, not Alistair or Geralt. He/she must be human, beyond that, it's wide open what the player decides to do. It's a very different experience than being forced to play Alistair or Geralt who have predetermined gender, predetermined appearance, predetermined personality and predetermined backstory.
I liked playing Hawke (I never got the hang of ME's shoot em up playstyle) because there was some predetermined to her. She was human, had a family, a history. But beyond that, it just set the stage for me to make her whatever I wanted to. Male, female, kind, funny, angry, the sky was the limit after the character parameters were set. I'd probably enjoy Shepard because that's the kind of character I like to play. Alistair I wouldn't enjoy as much because he's male, has a specific personality, a specific place in the story. While I have played male characters in all three games and enjoyed their stories, they were my boys, not Bioware's. And I vastly prefer a female protagonist because a lot of games just foist male protagonists on the player which gets old after 20 years of RPGing.