With a straight forward, valanced plot overflown with jaw-dropping monster fights and a sympathetic cast of characters, Gamera: Rebirth is probably Netflix's best take on Kaiju Eiga to date, and a more than worthy return for the Guardian of the Universe himself.
While the human animation might look pretty awful at times, it doesn't take long to get used to it. The stars of the show --Gamera, Gyaos, Jiger, Zigra, and Viras-- on the other hand, look absolutely gorgeous, shining their brightest during the fights.
Scale is managed perfectly, making every step, punch, and bite feel as massive as they can. The human aspect, on its part, is pretty decent. The cast isn't exactly the best or the most outstanding for kaiju films, but the characters are easy to like and care for.
The only drawbacks I would take into consideration would be the animation and the feeling that Gamera's relationship with the main cast could have been done better.