RKitch, I agree about what youv'e said re: Stargirl. While she isn't my favourite, Johns has, in general, taking a lot of semi-popular characters and brought them to the forefront, like Mera and Black Adam, for example. Another among them is Sinestro.
I'm thankful that Johns brought a whole new dimension to the Sinestro/Jordan dynamic. I think it'll be tough for him to ever top his GL run, but there are clearly a lot more stories left in him and I've thoroughly enjoyed most of what I've read from him.