Firstly, I'd like to say that the interface and look is a HUGE improvement from the old interface, and the images look immensely better than the last ones. There's less clutter in the way, so you have a more vivid experience with more of the map being shown, and less of the crap surrounding it.
Now, 3D mode: I have not yet used 3D Maps. Why? Because Google inconsiderately DIDN'T SUPPORT MY BROWSER!!!!! F@#K! I don't want to switch to Mozilla Firefox or Google Chrome to use the 3D Maps; I'm quite happy with Safari. I sent Google a nice message stating this, and now I am awaiting a reply (if they'll ever send one).
However, I am confident that Google will update their support for various browsers as time goes by, and i'm sure that they will take my feedback, as well as the feedback of many others.
I shall continue using the new maps, but for now, I score them a 6 out of 10, due to the lack of browser support.