Из веселой и примечательно интересной статьи Steve Yegge (former Amazon, now Google)..

JavaScript is probably the most important language in the world today. Funny, huh? You'd think it would be Java or C++ or something. But I think it just might be JavaScript.

One big problem is that it's JavaScript. Nobody wants to use JavaScript.

I'm serious. It's not that it's a bad language (it's not); it's just not the language they want to use. You know. Them. You. Everyone who has a favorite programming language. Most people only want to use one, their favorite, whatever they're best with, and when they switch to a different one, they're slower. They feel stifled, held back, uncomfortable. That feeling goes away in under a month of immersion in a new language, but most engineers begrudge that time fiercely, probably because they don't realize it's only a month.

Советую глянуть на статью хотя бы поперек. Досталось всем и Мозилле и Микрософт.

Ну и традиционно "про Ruby-on-Rails только хорошее"

So as soon as "Scheme on Skis" or "JavaScript on Jets" or whatever comes along, that Rails-like radical simplification of the huge ugly Browser Swamp, the game will change almost overnight.