I just don't like it. Maybe because I don't like jazz. Maybe because the songs are forgettable. Maybe because Gosling's acting was okay at best. Maybe because the romance is based on an affair (I don't think cheating is romantic). Maybe it's because the singing was just plain bad. I just did not enjoy it at all.
It wasn't awful, but, I think I must be the only person in the world who didn't think it was great. There were times when breaking out into song mid-conversation without some sort of elaborate set-change didn't make sense, The 2 leads weren't exactly talented singers or dancers -- no wow numbers. The sets improved by the time the final number rolled around, but the singing and dancing remained an afterthought.
Found footage can be better than this. Seems un-assumed here as they still want to use classic scenery effects. Just looks a really common hollywood movie forced into the found footage genre to me.