They did Kong dirty
He didn't just lose, he lost twice. The best they could give him was 'a round" in the second fight. And he didn't just lose twice, they went out of their way to make him look like a clown at various times throughout the movie.
Everyone was saying Kong had no chance before hand. He was already at a disadvantage because of the fact that he's not a nuclear-based nearly invulnerable creature. It's just what he is. He's not invulnerable like a lot of the Godzilla monsters. We all know that. You'd think given that, they would try a little harder to make it an even playing field, but they actually did the OPPOSITE. They made Kong look weaker multiple times throughout the movie.
Kong was sedated during their first fight. They stated this. You can actually see some kind of container/viles on the back of his collar before he rips it off, which implies he was still being drugged right up until the fight. It's not like someone gave him a needle and that was it. That's disadvantage #1. Then the fact that they made the fight over water is disadvantage #2. Godzilla being nearly invulnerable and having an advantage over water wasn't enough. Kong needed to be doped up too. Why they felt the need to make the smaller, weaker, less vulnerable of the 2 even more disadvantaged is beyond my comprehension.
Then when they go to Hollow Earth, Kong fights those dragon things. One of them wraps him up and appears to suffocate him with its wing. The humans have to help him out! What the actual fuck?! Why was this necessary?!
I thought the fights were really fun. They were well-done. But the longer the movie went on, there was stuff about it that didn't add up and this was one of them. They clowned Kong. They didn't overcompensate in attempt to make him on Godzilla's level, they did things to make him look WEAKER. I don't know what they were thinking with that.