I have extremely mixed feeling about the changes so far:
The marketplace changes are surely beneficial. I always wondered where the search box was and now it exists. Hooray! Ratings and reviews will come, also good! Searching, filtering, and sorting will also be well-received additions to the marketplace.
However, the new website's design reminds me of the website I designed for my 9th grade social studies project: the organization of the pages makes sense, but is also kind of painful. I really miss dashboard being its own tab, like why should I have to click through another menu to get to what I actually care about? Also, the "community servers" button takes you to the same place as the "what are the top servers?" button rendering the latter a pointless waste of space. Restore the "dashboard" button please! I also dislike the fact that clicking on the hamburger menu button does not hide the sidebar making it possible to accidentally click on something while scripting, editing a file, etc.
I was hoping that this revamp would make the website faster and more responsive. This did not happen! The website still runs about as slowly as it did before. Almost to the point where working on scripts has become impossible!
In conclusion, I sincerely hope that this update is great. But so far, I have not been impressed because I don't use the market anyway so I barely gain anything from changes there and I am disappointed with the overall website changes.