That it's "doable" to solo DA:O doesn't mean first time players will run into it. It may even be intended, since it was a popular way to finish Baldur's Gate 2.
Soloing DA:O is an extreme way to play the game and it's your choice to do so. If you play the game "like you're supposed to" I don't think you'll run into serious balance issues. With polish I was referring to the product as a whole. I pointed out the balance issues in DII because it's a -problem-. I don't think there's such a problem in DA:O.
