I am afraid I must disagree with you Jimbob... I don't consider it "site bashing", but a critique of performance.  When one of my $6.50 an hour employees is late for work, they expect and deserve a critique of that behavior.  (By the way... I have several part timers - 16 year old employees - that will call ahead if they even THINK they might be late.)
Make no mistake about it... Rendo is a business... and it is NOT a small one.  It has around 100 staff members, which is more than many small businesses and even large restaurants.  It is not "John's personal art website".  Far from it.  They take money from advertisers that expect professionalism... and that is NOT a term meant to bash the site.  It is simply a matter of conduct. That includes the ethical conduct (not to mention legal ones) of businesses whether it is a promotion (as in this case), a sale of goods, or a contract for services.

If you are thinking that Rendo should be "given a break" or "cut some slack" because many of us do this as a hobby... you are making a mistake.  It is OUR hobby... and THEIR business.  We should expect no difference then us walking into a craft store and expecting a high level of service.  In fact, as an internet company (as opposed to a "brick and mortar" one), they have far less overhead and thus turn a much greater profit than their traditional counterparts.  Yes... they are a business and should be treated as such.

So Jimbob... we should not overlook their performance.  If you do, you are accepting mediocrity... and that is a grave mistake.  You see, I like Renderosity... and I will continue to visit the site.  This incident doesn't change that.  However, I do expect them to realize that they have let down a customer (and WE are ALL their customers).  If we do not... as customers... let them know that they let us down, they may not learn from their mistakes. Now we must hope that they listen to this message.

So they WILL (hopefully) learn from this, and they will move forward and do better in the future.  We will continue to visit here and enjoy their site. But the bar is set and the expectations are clear...