More constructive criticism... a continuation on the scale issue.
All of the auctions I'm seeing tonight are tiny (around .1-.2 btc with discounts around 1%). The "Earnings" number rarely amounts to more than a penny in USD.
You couldn't pay me enough to sit around and tediously bid, bid, bid just to win up to 60 cents an hour.
That's not even enough to justify writing a bot to try and capture the whopping ~$14 going through there every day.
A couple weeks ago when I signed up they were auctioning lots closer to 5 btc, which works out to more like 40 cents per auction and $24/hr. Still nothing to write home about, but I could see a few people writing bots to go after that.
I think larger lots, with correspondingly larger earnings would help drive higher bids and far more revenue for BitcoinRebate (and shareholders).