Cutting out entrances and corner advice for commercials on what I believe to be fox cards. I obviously get that these tv channels make money through advertising but comparing the amount of commercials they have on American television is just insane. Regarding the entrances, I also hate how generic they are. Put in some effort, make it a show, it's an entertainment product and a great entrance is ideal to get both fighters and crowd going for the fight. Also regarding entrances: fighters with boring, unfitting entrance music. Totally kills the spirit.
Incompetent interpreters. Speaking one or the other language they translate when interviewing fighters myself, I can't believe how downright shitty some of those interpreters are. For example that guy last fight night in Moscow. Yeah he wasn't completely off despite seeming like he was either too bored to care or just stoned out of his mind, but some of his translations were simply bad and he left out quite a lot. Could've found hundreds and hundreds of people in Moscow who would've gladly taken that spot and done a much better job.
Reebok. Hate it. All those shirts and trunks have become so awfully boring as it's bound to happen when they're standardized. Usually realize how that bugs me when someone who used to have cool attires comes out like GSP with his Gi or Korean Zombie with his bad ass trunks. Or Anderson Silva who had a big fat Burger King logo on his which was both funny and iconic.
Referees that allow too much stalling and are very generous towards lay-and-pray fighters or very hesitant fights where there is nothing but circling for 3 minutes of a round.
Embarrassing post fight promos. Stuff ranging from everything between Nick Diaz passive-aggressively crying about losing again (which given the emotions in such a situation is actually kinda understandable, still looks stupid though) to the very pathetic incidents like Colby Covington in Brazil.
Another kind of post fight promos I dislike are those where fighters start off with thanking God, Allah or Jesus as if it was them who just beat up the other guy. Not because I have an issue with their faith or what they believe to be the cause of their victory, it's their business and if they basically want to take away some of their own credit from the win that's absolutely not my issue, I just think it's kinda disrespectful towards the losing fighter and I personally just don't like people always shouting around their faith or lack thereoff. Luckily we don't have any fighters thanking evolution or the inexistence of a deity or something like that for their wins yet.
And yeah, obviously terrible scoring from the judges. But that should be obvious, just like terrible handling of obvious fouls or faking incidents (the Poirier vs Alvarez that was declared a no contest comes to mind).