Im only 17 and so the only thing ive ever seen James Best in is The Dukes of Hazzard but I think he is so great in that show. Rosco is one of my all time favourite TV characters just because he is so funny. The laugh and all his various catchphrases are the most entertaining parts of the show.
Despite mostly playing Rosco as a bit dopey and childlike, when the need arises Best can portray so many other sides of Rosco. Take the episode Ghost of the General Lee from season 1 for example - Bo and Luke were thought to be dead and Enos and Rosco made the "discovery". Roscos reaction was amazing. Has me in tears every time even thought we all know Bo and Luke arent dead (they are however running around Hazzard totally naked!).
Then theres the episode A Boy's Best Friend from season 6 where Flash gets dognapped. Rosco is obviously distraught and totally lost without his dog and again even though we know Flash is fine and will be back by the end of the episode, the way Rosco's reaction is acted is very emotional. I think to be able to make the audience become emotional like that when we know there is nothing wrong says alot for the actor.
Theres also the episode Too Many Roscos in season 6 where the real Rosco is kidnapped and a fake Rosco (played by James Best) is put in his place. The fake Rosco is a big ol' criminal and is actually quite scary. Not in a "ahhh!" horror movie kinda way but in a dont wanna mess with him kinda way. The way James Best switches from being funny to being a scary criminal is quite impressive. Just goes to show his range of acting skills - at least in The Dukes.
I've also seen pictures of his paintings and they are pretty impressive too.....