I won't go too much into the UI problems, seeing as others have already posted on that. My issue is with functionality as a whole. It just doesn't work. The home screen takes forever to update and there's no real to refresh like we could with pull down in the original version. On top of that, it has so much trouble connecting to my server, both away and at home on the same wifi. I never had this issue with the old app. Now I find myself starring at a screen telling me my server is offline, when I can clearing see it running on my computer. And when it comes to being away from my network, I'm able to connect to my home server just fine through the web, app.plex.tv, yet as I said I can't connect at all through the app. Or, if I go to TV or movies, it keeps telling me I need to add content, when that's clearly not the issue.
I'm not sure what brought on these changes down the pipeline, but for our sakes go back. It may not have been as "pretty", but at least it worked correctly.