I did for my first ever character. Male Imperial with no face changes and the pre-made Warrior class. It was the first time I'd ever played a TES game and the first time I'd even heard of the series. I'd watched millions of videos on youtube, decided it was the best game ever and brought it. I was so exited that I didn't bother to change the Race or appearance.
That's awesome. I can't tell you how many "RPGs" I've played in the past that barely give us any choice about the character we play at all, so Oblivion for me has always been about the customized face, class, etc.
Well I didn't start the default character guy yet. Maybe I'll name him "D. Faultius" or something, ha ha.