I think it was on the old DCMB where I saw good and bad reviews about Planetary. I just never bought any issues to see for myself.
You ought to pick up the first volume, for the art if nothing else.
It’s a little like Astro city or Top 10 in that it plays with archetypes that are common in DC and Marvel (including a really sinister take on the fantastic four) as well as pulp heroes and similar tropes. The interplay between the three lead characters is fun, and reminiscent of the X-Files by way of Buffy.
Now I kind of want to go and re-read it.