I'm pretty sure they have delay on their part too, since they'd have to watch the person that is streaming with the clientsellyme wrote:
The primary thing I want to see in commentary is some kind of semblance of speed in calling - last year I regularly heard things like "[player] seems to be holding a full combo" a good 15-20 seconds after they've broken. I'm assuming it's some kind of technical issue and not just the world's worst reaction times, but it made the commentary pretty much useless, as any information they had was already redundant or false by the time the audio came through.
Beyond that I don't actually care a whole heap. Azer and jesse definitely seem like good commentator choices though.
I hate how the commentators sometimes go quiet in the middle of the song playing; it really cools down the hype and makes it less interesting to watch. Also when they discuss something completely unrelated to osu such as pepsi and popcorn, though like other game matches that have the same problem, it usually is due to lack of ingame knowledge by the commentator that they have nothing interesting to contribute to the stream.
Hopefully this year we'll get a more professional performance from the commentators, and commentators that have a bit more knowledge on what is happening.