I like the new design so far. Like others have said, regardless of how it looks, we'll still use it. The only difference is if it's super difficult to use or requires too much effort, we may use it less frequently but it doesn't look anywhere near that bad. I really like the new search function. The old search function just wasn't user friendly and it was impossible to search for multiple words with any kind of success.
A couple nit picky things that I noticed. I couldn't find the PM count anywhere. Also, one of the reasons I always stayed with the boring blue theme was because it was obvious which threads I've posted in since it's a green arrow coming off a light blue or light red box. With all the new themes, it's a little tan box in the corner or another little tan box and depending on how popular the thread is, could be stacked on yet another little tan box. It's easy to overlook it because it all blends together. That's always been my biggest beef with every new theme.