It will be a few days before I post my official review, but I can tell you that The Flash is fun, funny, and full of surprises. Do yourself a favor and do not get spoiled one little bit! You want to know as little as possible about what is happening and who it is happening to.
It is not perfect and it sucks that we got this multiversal film only days after the incredible Spiderverse, but The Flash is almost certainly the best film in the DCEU (not exactly a super tough thing to do... Wonder Woman is the bar you need to clear).