I'm not going to outright say they're my favorite to watch, and I 100% understand why a lot of people don't enjoy them, but I greatly respect their talents.
There's something about combat sports that I find distinctly more remarkable than the usual ball & stick sports. Part of it is brutality, part of is the courage it takes to fight, part of it is the absolute individuality and part of it is the sacrifice it takes both on the fighter's body and future. I also think that the skill to fight is one of the toughest to enhance.
You can maybe count on one hand the amount of people in the history of combat sports that went through that meat grinder and came out unblemished. There's Floyd, there's GSP (to an extent), there's Rocky Marciano... But all of the others ones fall on their ass at one point. Or they have long-term effects from fighting. Or they stick around too long because they need money. I mean shit, just look at how many ex-boxers are punchy. Listening to James Tony talk is fucking sad, man. Who the hell knows what's going on in his head and what kind of CTE he has.
With all that said, and taking all of that into consideration, watching Floyd or GSP absolutely school many of their peers and making world class fighters look ordinary in comparison? While not the most entertaining, I find it rather amazing to watch.