That post is utter garbage. Seriously.

Most of the the points are for issues that were fixed years ago and then you get classics like "forces the poor habit of implicit schemas in nearly all usecases" as if some developer is going to somehow stumble on the fact is it a schemaless database.

It's like trying to say "Linux is shit" because of issues found in 1.0 of the kernel.

Most of those points are fearmongering, outdated, opinions, or improperly cited. Every database has problems. Mongo has more than most. But I honestly think people dislike it so vehemently primarily because they've monetized so strongly.