Oh I honestly don't care that he's a romanceable character. I just don't like it when they take concepts in the beginning of the game and change them later. It's annoying. He could have been romanceable even if they kept that concept of templars and "purity", even if it is only implied, and only as a discouragement due to their lifestyle. I think it would have been better then actually, since I'm sure many Cullen fans would love to have their characters be the one to "rock his world" and pop that templar cherry.
And there'd be the added drama and scandal, which always makes things hotter in my opinion.
edit: Lol, reminds me of Ironclad.