I wouldn't have finished the game with a Tav
This is rare according to statistics, vast majority of players prefer playing a custom character. You can argue Tav is boring, but that's also a trade off due to origins, he didnt have to be boring. Custom characters like the Warden, Shepard, Hawke feel much more like they're part of the world and important characters compared to Tav. I dont think a single person bought the game because they wanted to play as one of the promotional characters instead of interacting with those characters with their avatar. Have you not played Mass Effect, Dragon age? Being able to playthrough the game as morrigan, alistair or varric would not sell copies, but enabling the player to play as them would require sacrificing something. Now the actual origins of DA:Origin did add a lot of value, making the player character part of the world and immersing the player into the appropriate chosen origin/background.
The point is that everything is a trade off, dont think about what you'd lose but what you could potentially gain. Most people would have their experience improved with better reactivity and more depth in dialogues and interactions with companions. There are games that you can make comparisons with where the feeling of a party of adventurers is stronger. Consider that vast majority of players wont do many playthroughs either, and most people report that origins feel like Tavs most of the time with the origin skin, but i wont try to confirm this.
If you dont like the custom avatar enough to play the game, the solution is to make the character better with more depth - throwing various "origins" at you is not the solution and it's content most people wont benefit from as they're not interested in it and not gonna play the game 10 times.
