"No open source project has received more criticism in recent years than MongoDB."

[citation needed]

Suggesting that the 1.0 version number should have been reserved until more recently makes me think that what the author of this post is really saying is something like this:

"MongoDB wasn't really production-ready until recently. People who wanted to test something bleeding-edge out in the real world should have still been free to do so, but branding the product as a beta and giving it a sub-1.0 version number would have helped set expectations correctly."