aside from the fluffy-haired second-team All-SWC flanker 1970 and noted builder of Venezuelan high rises, I have a soft spot for some of the goofy villainous characters from the early self-container episodes: the maniacal van-driving semi-kidnapper Willie Gust, the dastardly Edison Faraday Haynes, the fearsome criminal gang who kidnapped Bobby, golden-voiced budding county superstar Garnet McGee, et. al. (not sure if they counted as 'guest stars', though).
I also enjoy seeing some of the old pros in action: Mr. Eugene, Scotty Demarest, Vaughn Leland, Ben Stivers/Wes Parmalee
I like Holly Harwood too (*ducks thrown wine glass*) and found Angelica Nero entertaining in her absurdity, but couldn't stand 'god's gift to women' Alex Ward and dull-ass Clint Ogden. Mark Graison's initial pursuit of Pam was off-putting, but he grew on me over time. I liked Alan Beam, too.
Leslie Stewart's storyline was kind of nonsensical - she basically sabotaged Ewing Oil at every turn, which barely seemed to register with JR who completely lusted over her, even seemed to want to marry her... then they finally did the deed and were like 'eh, that was kind of mediocre' and she disappeared and was never mentioned again.