In terms of pure mathematical typesetting, it's great, and, as they mention, Mathjax does a fantastic job of handling equations in webpages. Yes, TeX takes some

In terms of pure mathematical typesetting, it's great, and, as they mention, Mathjax does a fantastic job of handling equations in webpages. Yes, TeX takes some learning, but it's a let less verbose than MathML for the same equation, and being distinct isn't necessarily an issue: there is precedent within HTML, such as CSS and Javascript code being embedded within pages. A browser with native support for (a subset of) TeX would allow for a lot of technical papers to be presented in a fully searchable, device agnostic manner, and would avoid the additional learning curve or conversion to MathML. For layout, though, HTML with CSS is the way to go if your prime target is web.