You can call it whatever you want, from weak plots, script, and mostly CGI is mainly the problem that many people are disappointed about.
But hey! It's DC Comics! I always have my expectations low for DC movies. They're not as good as the Marvels for some reason. But the Flash movie, I TRULY ENJOYED IT!
It's fun and funny. There's so much going on in the movie, Super heroes everywhere and it's kind of mess. But I somehow I learnt to ENJOY IT by a LOT. It's not the best but enjoyable. People say Ezra's acting is subpar but he's actually alright and he made me laugh loads of times!
CGI was funny though but I find acceptable. But all I came here to see in theater is Superheroes. I'm not a fan of the superhero the Flash. But I am a fan of Barry Allen, I think Ezra made him really cool. The Flash moves and choreograph was meh though, the way he runs, his skills and his fights. But it's not the worst. Other superheroes are enjoyable. Good to see they all come together.
Me and my wife truly enjoyed it!