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My initial reaction was my library appeared gone; the layout is quite different. Yes you can view your content, but only partially? I've over 300 movies and now can only see like 10 or so - very short scroll list; my initial reaction was my library is all but gone. But, the biggest pain was that the display orientation is now fixed - landscape with my iphone 6 power buttons down - not user friendly if you want to adjust audio via buttons. For some 4x3 movies it was nice to see them portrait mode (vlc).
So I trashed the "tv" app and went to see if I could download the "videos" app - no joy; so went the route of finding where to get the bonafide 10.1 download, installed that and restored my last (content) backup. All smiles now after a tense 24 hours. I was in the midst of attempting to stream from an HD attached to my airport extreme but it's not supported, so I'll probably go the "mini" route to develop an itunes server (moving from a macpro '12 desktop).
IMHO if they wanted to attract / redo the "TV" / streaming experience by all means do that but leave videos ALONE; ditto for the music app. I guess that's the price of quality, you have to break things to get people to notice you changed something !?
Alas, I guess I'm old school - I *PAY* for my music / video, store them them on a server using the cd/dvd media as a backup, and stream from one of my 3 (!) Apple TVs.
I'm all for s/w upgrade, but it really pains me that I cannot even pay for something, that once it's working, to be left the heck alone.