What I meant was that the article was not about MongoDB at all. I think thefreeman summarized it better than me on his reply: the author is talking about his experiences on running more than one DBMS in production, not about MongoDB in particular.
I'm not even saying if the article was interesting or not. It surely has it's merits, it touches a point worth discussing (the downsides of trying to cover one DBMS's weakness throwing in another DBMS in the mix), but I was uninterested. I was expecting to hear why MongoDB wasn't fit for his use case, to better understand when to use NoSQL and when not to, so yes, I was indeed biased waiting for something different—but, in my defense, I say I was biased because the title made me think this way.