There are a lot of people still switching to MongoDB for various reasons, but its no longer the cool kid on the block and thus not a lot of people are going to brag about switching to it.
I think a lot of people switched to it because it was cool, and maybe assumed that it could solve any application data storage problem and are now finding out that it may not have been a great choice for them.
I don't think its appropriate to take away from this that MongoDB and/or other document stores are bad. Instead, I think its important to understand how they work and decide how well it applies to your use case. It's not going to work well for all applications.
I think a lot of people switched to it because it was cool, and maybe assumed that it could solve any application data storage problem and are now finding out that it may not have been a great choice for them.
I don't think its appropriate to take away from this that MongoDB and/or other document stores are bad. Instead, I think its important to understand how they work and decide how well it applies to your use case. It's not going to work well for all applications.