All of the things he does I would have dismissed as not working at all, except he does them.
Further, I recall a friend of mine who used to compete in full contact karate (years before the UFC) talked about fighting in tournaments in South America against some increadibly tough guys, where there was no rule against excessive contact and knockouts were a lot more frequent.
IIRC Joe Rogan made a reference to similar tournaments when he was talking about Machida's standup at one point a couple of years ago. So I am open minded to the idea of other karate guys out there having a reliable standup game. Machida also has Sumo (to which he credits his takedown defense) and a BJJ blackbelt so I'm not saying his record or skills are 100% due to karate. Just that he is an example that at an elite level a karate stand up game can be effective. In fact, to date he is the only guy who has had zero problem with Jon Jones' leg kicks and I think that is a result of his stance and foootwork.
So yes, Machida is the LeMans Corevette, but that style can actually build LeMans Corevettes.
Sliat on the other hand seems to employ a lot of trapping and 'structure breaking' that I don't acutally think anyone can apply in a pressure situation. Same with Aikido, Wing Chun, or Ninjutsu. The training techniques they employ are- I think- counter productive to performing in a pressure situation.