Some are really good.. Some are meh.. I'll try to keep this spoiler free, apologies if I say something that might be perceived as such.
The Green Lantern one might as well have been issue 14.. Green Lantern annual should've been issue 13.. They were not out of continuity, out of time, or anything of the sort.. If you skipped the annual or issue zero, you're probably going to be confused if you got issue 12 to issue 13.. So if you like what's going on in GL, then you should like 0, but, again, it shouldn't have been issue 0.
Wonder Woman was, as it has been, amazing.. I loved the direction Azzarello chose to take with it. He gave it the feel of a silver age comic.. The art style, the writing style, the type of story.. Also a funny note that "War" in the comic looked like Brian Azzarello.. The comic was also just good.. It had the gimmick of the chosen style, but that gimmick didn't get in the way of telling a really interesting story about Wonder Woman's past. I seriously can't recommend Wonder Woman enough.. Issue 0 or any others.. It's honestly become my favorite series of new 52..
Justice League is all about Captain Marvel (who I think is just going to be going by Shazam in new 52).. It was one of the better ones I read so far.. They're doing a really good job developing the character..
Those are the three that stuck out in my head right now.. I have some others to read still.. I didn't read Talos #0, not sure what it is (maybe typo and it's Talon?? Which I also didn't read)..