From my experience, the problem is not how does any NoSQL solution stand up vs. any other NoSQL solution. The question to ask is "What caveats affect me the least?" and then go with that NoSQL solution. In the case of MongoDB, the biggest issue (at least in the past) is that the caveats simply aren't known well, or at all!

Compare this to something like Elasticsearch, which is well-known (and well-documented) to have data loss in certain situations.