This ridiculous question, in my opinion, proves how wrong Google got it with panda. Given that panda can hit an entire domain because a small number of pages aren't 'good' enough according to a machine learning algo, is it now unsafe to post new content?
The way I interpret it is that panda can only give you a neutral-negative score, with the best possible outcome being 0. Therefore, adding another blog post / review / gallery / whatever only increases the risk of having a small number of pages that fail the test, getting your entire domain whacked.
Of course you could argue that with panda promoting high quality content, the rising tide will push up standards across the board. But then why does so much junk persist in the top 10?