I played about an hour last night. It's a kids game. It's decent, but a kids game. It's not really for RTS enthusiasts, but more for getting kids who've played Minecraft into the RTS genre a little bit.
For myself, I'm not crazy about it being a hybrid RTS/Action game and would prefer it was strictly RTS. I think Minecraft Dungeons was a better Dungeon crawler than Minecraft Legends is an RTS game. I'd give it a 7/10 for now. They might evolve it more over time into something a little more RTS-like, but that's where I stand right now on it.