I think bad barriers are a good place to start if looking for value. A genuinely good horse will overcome the problem far easier than the market calculates.
I remember following a thread where the writer backed all favs drawn in the widest barrier between $3.00 and $4.20 in the morning paper pre-post. He had 27 consequetive winners although he only had 4-7 bets per week. A fluke? Maybe but it's one ******** of streak, me thinks