I am a massive Flash Fan. I love the TV series and was so excited to see him brought to life on the big screen. Now personally I wanted Grant Gustin to play that role, but alas the role was given to Ezra Miller. But less about casting and more about the film.
In places it was light hearted and amusing, in others just silly and almost trying too hard to be funny. From the daft pose to start running, to the awkward earlier version of himself, it's just not great. I was left more confused with the ending and post scene credits.
No real explanation of how his dad was freed, how batman became Clooney and what happened to Supergirl. Hopefully more will be explained in the upcoming new superman film, but for me this was a flop.