I'm no CGI artist, I have no idea how they do it, but some of the scenes in this movie are absolutely beautiful. On my 4k TV it looked real, breathtaking.
Unfortunately that's the end of the good. It's all downhill. The actual bird animations were very very cheap, pardon the pun. In some parts you can clearly see how they couldn't manage to animate what they wanted to so shot a different angle or used shadows. Terrible.
The sound was awful. The music didn't fit. In most movies the music is almost unnoticeable, you don't realise the ambience it's creating, it's part of the movie. Here, it's clunky, as if they only had 2 hours left to throw it in at the end, and no budget left either.
The acting... I'm confused. I know the two main stars can act, but here... It was awful. As if they've walked into the studio, read their lines, and the directors gone "yep, cut, thanks for that." And then all the parts have been shoehorned in, with terrible pauses between lines. No emotion, no timing, no conversation.... Just a collection of clips that don't work together. It doesn't even sound like they're in the same room.
This will never become a classic, it will be in the bargain bucket or the bin.