This is a hell of a rant against the Rails community by Zed Shaw (creator of Mongrel). It’s passionate and angry, so yeah maybe take it with a grain of salt but he does make some solid points, although there is a lot of vitriol pointed towards specific people. It is entertaining though.
One point that is troubling about Rails is the revelation of how much restarting Rails servers required when RoR was released:
"Let me put this into perspective for you: I’ve ran servers that needed to be restarted once in a year. They were written in PHP, Python, Java, C, C++, you name it. Hell, I’ve got this blog on a server I’ve restarted maybe 10-20 times the whole year.
"Now, DHH tells me that he’s got 400 restarts a mother fucking day. That’s 1 restart about ever 4 minutes bitches. These restarts went away after I exposed bugs in the GC and Threads which Mentalguy fixed with fastthread (like a Ninja, Mentalguy is awesome).
"If anyone had known Rails was that unstable they would have laughed in his face. Think about it further, this means that the creator of Rails in his flagship products could not keep them running for longer than 4 minutes on average."