You gotta remember guys this is MMA and hes forced into a very limited game (like cro cop) because ehe wants to keep the fight standing, and to avoid the takedown, he has to do things like fire 1 shot at a time, and wait to counter, be cautious and hesitant, and not use the full arsenal he has.
Couple that with a big powerful, fast, long , hard headed guy that he fought against (someone that wouldn't last 30 seconds in kickboxing with a prime hunt but non the less a potent awkward human being) and you have what looks like mediocre striking.
Truth is hes an excellent striker, he just SEEMS worse than he is because its MMA , and he wants to stay standing.