Legit very skilled fighter. Cool personality. Been a figure in basically every notable org.
The fact that he was never super ripped does tend to have an effect on people, if he got caught juicin' and looked like Ubereem people would probably think worse of him
ALSO
although he's a very skilled fighter, there hasn't been any hype train around him in over a decade like there was with Ubereem, he hasn't been going around smashing an entire division and in GOAT debates like Jon Jones and Silva..which is where you see a lot of the hate for people like Overeem and people disregarding Silva's spot as the best MW ever. The fanboys of other fighters don't need the ammo in arguments since his name never comes up. If Barnett popped and was in the title mix people would be shitting on him more.