2 years later and the problems I have are not directly related to the metro. It is reliable but I'm tired of it.
Rush hour has been dismal. The crowd does not seem to end. You are squished between two uncles and you're in fear of your life that your laptop will snap
Just travelled by Mumbai metro for the first time
Honestly great experience, far better than the Local. The stations have amenities and good infrastructure. The metro cabin is air conditioned and sanitary. Can't wait for the entire metro line to be finished!