I think you are overstating things. I don't think the community needs a white knight to protect them from "disappointment" - especially this early.
Who knows what optimization tinyCLR will get? I can't speak for others, but Gus' responses don't seem at all dishonest. It's a new thing, and now in the hands of people who are excited about .net on tiny devices, instead of the large, slow, and under-resourced-and-under-motivated group that was handling .netmf and seemingly happy to ignore it and let it die a slow death.
One way to kill any new fledgling thing is to be overly negative-nancy and debbie-downer about it, before it even takes off.
I'm personally excited about tinyCLR, and checking my mail daily for some compatible hardware to arrive.
I'm not saying you shouldn't share your opinions - that's what this place is for, and my opinion isn't any better than yours - but I do want to offer my opinion that you are coming across as a bit of a "blah blah blah it's never going to work, I'm really smart and I'm going to tell you why your new thing is actually probably going to be lame and not as cool as you make it sound" sort of a grinch, here.
(No offense intended, just an observation of how your posts are coming across to me personally. I hope you understand the spirit this is offered in. I'm kinda aspergerish myself, and misread people all the time, so take my words with a grain of silicon)