I'm pretty sure their download numbers say otherwise. One or two HN threads complaining about MongoDB every month are not a good indicator for their future success.
Yeah. FWIW, working at $BIGCORP, I'm starting to hear buzz around Mongo from quite a few not-very-technical people. I'm pretty negative on Mongo as a technology, but there's no doubt that it's generated a lot of attention.
In the short term it's probably inversely proportional: more 'complaints' means more people on the platform (or at least experimenting with the platform). In the long term we're all dead anyway.