I'm not necessarily Anti MS. If I ever see MS software that I like, I might use it. There's that whole "evil corporation that has stupid license agreements" issue to deal with before I could use the software. And we'd also have to start dealing with the pig droppings from the sky as they fly overhead.
But seriously, the main problem I have with MS Office generated HTML is that it is proprietary, ugly, and gnarly, as I have already mentioned.