disclaimer: I'm not a node.js expert by any means, and most of my day's work is on client code written in system programming languages (C and C++.) that which isn't, is in C#. I don't know of anything in particular that they're doing wrong because I don't really keep in touch with that particular PL community.
that said, my ideal pitch page would contain something to the effect of: "extensive standard library, including robust facilities for concurrent/non-blocking I/O". nothing marketing-y about non-blocking I/O or a given programming model making a language intrinsically "fast" or scalable, like nodejs.org's:
"This is in contrast to today's more common concurrency model where OS threads are employed. Thread-based networking is relatively inefficient and very difficult to use. [...] Almost no function in Node directly performs I/O, so the process never blocks. Because nothing blocks, less-than-expert programmers are able to develop fast systems."
in addition, node.js is in a little bit of a weird position of introducing a whole new language environment for an existing programming language, since node.js is effectively the vanguard of server-side/concurrent Javascript: I'd hope for an official series of tutorials designed to introduce the nonprogrammer, or "Web app-only programmer" of Javascript, to concurrent programming in the large.
that said, the node community might already be doing things like this which aren't obvious to the layman, and if so, good on them. good concurrent programmers are hard to find, and anything that encourages people to learn how to do concurrency well is a good thing.