Look, I grew up in the 80s and 90s so to me Batman IS Kevin Conroy and Superman IS Tim Daly. In previous DC animated films when those 2 actors were not providing the voices it was just a little off-putting. Not that those movies were bad, but it was distracting at points.
However, this one? Great. Even though these aren't the guys I would have chosen, I didn't find myself groaning and longing for better days lol(which is good cause it looks like these are the guys from this point on). The dialogue between the characters is spot on. Every character acts and sounds how you would expect. Batman is serious and precise. Green Lantern is brash and arrogant. Superman is altruistic and a little cocky. Wonder Woman acts like she just got off the island but is strong and confident. Flash is mouthy and quick to action.
Then you get Cyborg and Shazam. Again, my Justice League of old didn't look like this. But they work. This is a bit of a Cyborg origin story(maybe about 15 minutes broken up here and there). Where everyone else shows up doing what they do, Vic is suddenly thrown into this and is still trying to work out who he is now. Shazam is about what you would expect, an immature show off.
Last but not least, there's Darksied. I think this is where the story really shines. He's finally the big imposing unstoppable force that you should fear. It's hard to create a story line where it takes everything the Justice League has to come out on top. With near god like people(Wonder Woman even describes them as the Greek Gods: Hades, Apollo, Hermes, Hephaestus, Zeus) it's always been a hard sell that some of these guys that can pretty much do whatever they want can't beat some of the clowns they go up against(not a Joker pun). But when a being the size of a building comes to destroy your planet, it's gonna take some team work.
So, even though it doesn't look or sound like the Justice League I grew up with, it's still a fun movie and I find myself wanting to watch it again and again. This story is based on the New 52 Justice League Origin. If you've been away from DC for a while or was never much of a fan(I've always been a Marvel guy) this will bring you back in. I'm not saying you'll jump in with both feet, lol. But you'll look at DC with a new perspective and may make you check out some of the New 52 comics next time you go to your local shop. This ain't your dad's Justice League...and that's a good thing ;)