I like the Gorn being legitimately scary, but to me it kind of retroactively highlights how silly “Arena” was. You can’t really compare modern TV with the episodes from the 60s, but stick one of these Gorn on the planet with Kirk and he would have been proper fucked. I can accept it easily enough and take it with a grain of salt that, if we assume they were going to re-shoot the episode today with Paul Wesley and modern cinema techniques that the fight scenes wouldn’t be these silly ponderous things and the episode would probably largely not have Kirk confront the Gorn at all, mostly running away until the big climax with the “cannon”. However, it is kind of an unforced error, where they could have simply introduced the aliens as a totally new species without really losing anything while also not highlighting how silly the rubber suit Gorn was.