Doesn't hold a candle to Wonder Woman, but tall-buildings worth of leaps (and bounds) better than everything else that's come out of the DCIThoughtSheWasWithU. It's weirdly kind of... The nicest? Of these movies? Which is not the kind of direction you would think a film in this series would go based on how it started, but Jason Momoa is just charismatic as Hell, and Aquaman leans on that a lot.
By the time it's over, Aquaman really does hit just about every cliche of the genre there is, which is not exactly high praise. It's certainly not without heart, but it is still more spectacle than substance. But unlike, say, your Transformers 4, a movie often levelled the same criticism, it is not trash.
Final rating:★★★ - I liked it. Would personally recommend you give it a go.