Web's great for individual contact sheet style galleries, but it's not really for generating a complete web site - which is what a lot of people hope it may be. To use these galleries in a full site, you need to learn some HTML.
Even then, you're stuck with the issue of updating the pages. Imagine when you have new pictures to add, or just notice a dust spot you'd overlooked on one image - you have to regenerate the entire gallery or figure out where to edit the HTML. That's a shortfall of all these static HTML galleries - and in that sense LR is no better that many other cataloguing apps or image browsers.
A year ago I got as far as writing a web gallery for LR that allowed for multiple galleries (see here
. I think it's as polished as anything around, but I never got round to releasing it - one reason being that I wanted to address the updating aspect too. I just never got round to it.
But I also think that if you want a full web site, you're really better off with a WordPress-based site which provides an online content management system. So you'd rely on exporting and uploading to this, rather than generating static galleries from any of the templates available for Web.