If you've spent any appreciable amount of time on Hacker News, you'd know that there has been pretty big hype behind Node.js
A considerable percentage of HN's visitors deal in exactly the realm that node.js serves: that gooey layer between browser and back-end systems. This is like complaining that coffee enthusiasts are interested in burr grinders when it's entirely unsuitable for chipping tree branches. There is no surprise that many HNers find node.js interesting and exciting.
Sure, like I said, it solves some really hard problems and makes some architectures easier to execute on. But frankly, about 20-30% (probably made up percentage alert :)) of the stuff I people using Node.js for on HN is really just tech wankery. There's no real reason to be using Node.js for it, even though they will tell you that it's the only thing that worked for that possible problem!
Likewise, another 10-20% is people converting working code from a perfectly suitable technology to Node.js because it's the new cool thing.
It's not that either of these cases is "wrong." They know their problems better than I do. But I've been doing web development for about 10 years, I've seen this cycle a few times, and I know that every new tech has ridiculous adherents that do that stuff (e.g., Rails went through the same cycle except for "productivity reasons"). Everything looks like an old and busted nail when you have a new and shiny hammer I guess.
A considerable percentage of HN's visitors deal in exactly the realm that node.js serves: that gooey layer between browser and back-end systems. This is like complaining that coffee enthusiasts are interested in burr grinders when it's entirely unsuitable for chipping tree branches. There is no surprise that many HNers find node.js interesting and exciting.