Well, apart from the subscription/full license discussion (let's not go there, OK? :-)), the look and feel is *the* big issue that is being raised in the forum. It's a really big issue for a lot of people, and I think it would be a good idea to take a serious rain check and go "yeah, this approach doesn't work, we need to reverse the change". I think that would also reassure people that the Bakers are listening and taking usability issues really seriously.
FWIW, personally, apart from a few very minor things (and text size isn't one of them, even though I've had to start wearing glasses for screen use in the last few months and I don't have huge monitors), I don't see the new UI as a step backwards (or forwards for that matter - it's not that different to my mind).