I just bought a house at auction (homesearch.com) for what I believe to be a steal, but the appraisal will tell. Just needs minor cosmetic work (carpet, paint, a new door) but the inspection will tell me more. I too peered through the windows but wished I would have had my agent let me in first. I've gotten in the habit of driving by and peering in then making an offer because I see so many houses that end up as duds because the listing agents are careful to either avoid the trouble spots or they literally shop them out.
So I started visiting myself, putting it under contract and then seeing it. Not going to do that anymore. At the end of the day, my time is actually more valuable than the agents who really just unlocks a door and fills out a cookie cutter form. Also, I'm completing a transaction that results in a 6% commission split among four people. I shouldn't act like their time is more valuable than mine...Neither should you.