I haven't had any problems, except with the beta android app. I really never watch videos on my phone, though, so it's no problem for me. The desktop client is really all I use. I don't know what you mean about the account management. The only thing "account" related I know of is them linking your email address to your follows. Your publishes and LBC is all linked to your local cert, so you have complete control of it. Also, I didn't know you could watch without downloading...how do you do that? edit: if I had to complain about something, it would be that there's no option to either keep scrolling after 50 or whatever results or go to a next page.
-I found the setting to not auto download. I don't run a debian variant, so my updates are a little delayed.