He's a good fighter and he's entertaining most of the times, that's about it in my opinion.
I also fail to see what his fans see in him apart form his fighting skills. The guy isn't particularly great with a mic, he doesn't sound very intelligent or wise, he doesn't have a lot of charisma, he comes out as "childish" with his manga shit, he looks a little bit like a "try hard" sometimes (his dance contest with Romero for example), he grows tits out of nowhere. I don't know man... I mean, Ronda Rousey had fans too despite being a shit person so go figure... I think many MMA fans just want to follow the hype, to be part of "something", and Adesanya receives a lot of hype these days. If a new guy comes to the UFC in 2 years and beats the crap out of Izzy, these same fans will jump on the new bandwagon, and all of a sudden we'll start to read, from them, that "Israel was never that good". The same shit repeats over and over again on Sherdog.