I for one am thrilled with the new interface, minus a few details (mentionned above). As a general rule however, people on the internet hate change, so complaints and inertia are to be expected. At first it was a lot of new stuff all at once, but if Adsense is important in your life, it's worth dedicating some time exploring it. If you have experience with Google Analytics (or even the Google financial charts), it gets familiar. I still discover a few things every now and then and some are really crazy powerful. Comparing various channels, various values and various time frames, it's great. Coupled with Adsense stats on Google Analytics and you have tons of info on your site, for better optimization down the line.
AdSenseAdvisor did create this thread for the non converted though so, have at it. But I see complaints where people just haven't figure out how to do the things they want, if they only spend some time on it, they would. Once you put the initial effort, there's simply no going back.