Let's break this down a little. Let me say from the outset, I have nothing to do with the Woo product team.
If what you mean by "the Woo Commerce product add-on" is the free plugin, or it's one of the the pay plugins, by your own description, you've received heaps of support on the Woo support ticket system.
Your main complaint seems to be that it took them a while to find the bug for you, and for heavens sake, why couldn't they have figured it out sooner...
Second complaint seems to say, 'why can't they get it right the first time, why do they have to have so many maintenance releases?'.
There's no such thing as a perfect release, especially a major one like 2.0.
You seem to equate the number of maintenance releases with a shoddy product. On the contrary, it shows an active development team repairing bugs as they find them.
And as a relevant aside, any web designer (customer) worth his salt always applies and tests updates in a development environment, before applying updates to a production system.