I tried to do simplest thing: create playlist - the only thing I'm really missing not having YT account (beside commenting).
1. First of all, it forced me to create Invidio.us account. Why it can't store everything in my cookie?
2. Next, I searched for a video typing its YT code "fVCAFvIq_F8" - no results. After several attempts I figured out that sometimes it does find it and sometimes it doesn't. Weird.
3. Alright, I copied full address of a video into search box, clicked on result - and got an error: "The uploader has not made this video available in your country." Umm... What? I have no problem watching it on YT itself, why would Invidio restrict me? But even if it was country-restricted, why would Invidio reproduce this stupid Google-imposed geographical restrictions/discrimination?
3. Very irritated, I went for another video (OlNC6gK2y0I) - only to get another error: "The media could not be loaded, either because the server or network failed or because the format is not supported" ...
4. It was getting boring, but for the sake of experiment I went for yet another video - Invidio found it and played, but... there is no "Add to a play list" button? Turned out, first you need go to a settings, scroll down, find and click "View all playlists" link, on the next page click "Create playlist" link, on the next page create it, then go back to a video you wanted to add and add it. Thats... a clusterfuck.
5. Alright I go to a front page - where can I see my playlist? Nowhere. You need to find and turn on separate setting just to get "Playlists" link on the front page. (Isn't it obvious that I need playlists from the very fact that I created it?)
OK, maybe at least Invidio has additional functionality compared to YT, like downloading video? No, "Download is disabled." Why?
To all of that I must add that Invidio.us worked very slow, sluggish and unresponsive. Occasionally I was getting "Rate limit exceeded" error just trying to open front page.