I can assure you that I still follow the same YouTube channels I was following before and my complaints about the comment system are very well-informed. I will concede that comment threading is
somewhat better, and it's nice that people can actually post links now, but there's still plenty to hate. Hell, here's just what's annoyed me in the last
day:
I can't keep myself signed in. Well, kind of; g+ UI was designed by trolls, so what actually happens is that I appear to be signed in until I actually try to do anything, at which point I'm asked to sign in. Sometimes I even sign in, try to check my notifications, and am asked to sign in again.
Anytime I post a comment "Also post to Google+" is pre-checked. I can't make it unchecked by default.
I have had a YouTube account for years. Since the changeover, I receive more spam from random strangers every week than I did over the rest of the account's lifetime combined. I now also get newsletter spam from YouTube itself (I'm now looking at an email entitled "Well... these love songs are awkward on YouTube", like that is something I would ever want). On the bright side, I clicked the unsubscribe link and unlike the last three times, it didn't throw a server error, so I'll see if it takes.
Despite never flagging any of the above as spam, my Gmail spam filter has started catching my subscription emails as spam. That is, the legitimate communications from YouTube that I specifically asked for are the ones getting killed, as opposed to the scummy newsletters I was autosubscribed to and the new spam vector that is g+.
If this stuff seems minor, keep in mind that it's all the fault of something that I didn't ask for, never wanted, and actively tried to avoid.