I was discussing this with a friend, I said I was excited but cautious because Leto hasn't been a main character in a good movie in a very long time. He said Leto his ups and downs, but when thinking about it he said he realised the last good film Leto was in as a main character was Dallas Buyers Club...12 years ago.
If anything we should get a good soundtrack from this movie.
I imagine it varies between countries. In the UK I would say I'm happy for laughter, and the odd gasp. Anything more such as cheering, singing or clapping is not on to me personally.