Agreed. Planetary would be amazing to see on the screen.
That being said The Authority was brilliant. IMO, it was one of the best comics of the last few decades (the Ellis run not so much the Millar run). Apart from Morrison's JL, it was one of the few high-concept books on the stands. It was ground-breaking in many ways (the Millar run while still good leaned into the meanness a little too much). The evolution of Stormwatch into the Authority was amazing to watch in real-time.
At the time, I don't think there were any "out" superheroes at the time. Seriously, DC censored the gay kiss at the Apollo and Midnighter wedding. The Absolute Authority is a must-read for anyone that loves superhero comics.
HOWEVER, The Authority DOES NOT fit into the DC universe proper. As I mentioned earlier, the team was created in a certain context, in a certain setting at a particular time. Outside of that setting, it simply doesn't work. The Authority is almost as powerful as the Justice League and they pre-emptively take down their enemies (including in some cases, entire countries, planets, and even "God"), it just can't work in the DC universe without radically overhauling the concept.
Nonetheless, I look forward to seeing what Gunn and co will do with them.