Yeah, Booster is pretty popular with fans, especially when he and Blue Beetle get to team up. Fans might've maimed the JLU writers if Booster didn't get a moment. xD
Shining Knight and Vigilante were my two favorite non-'original seven' League members, even before they had thier times to shine in Hunter's Moon and Patriot Act (a favorite episode). They just seemed interesting to me, had stories to tell, and I'm glad the writers took time to show them. Kinda wish we'd seen some of Crimson Fox though, we really only saw her in the first episode of JLU in the crowd. She seemed cool, though her power might've been hard to work with storywise.
But getting back to Brave and the Bold (we've been a smidge off-topic, kinda-sorta... xD;), it's interesting we'll be seeing Red Tornado in it, of all heros. We haven't seen alot of him in the 'toons so far, so this could become HIS moment to gain some new fans.