If you search for a second you'll find bad things about every DB out there, my idea is that it is better to pick a product that seems designed for your use case

If you search for a second you'll find bad things about every DB out there, my idea is that it is better to pick a product that seems designed for your use case and try it first hand. Stress it, socialize with it, and in a few days it will be clear if it is worth investing more time or not. After all for every bad blog post about Mongo, Redis, Cassandra, and so forth, there are many good as well, so you can collectively consider this blog posts as personal experiences worth ten min of your time but possibly not so important to change your mind about trying it first hand.