Having now also read Suicide Squad, Teen Titans, and Deathstroke here are some thoughts and me ranking them.

#4Suicide Squade # 1
Harle is pretty awesome in this. Dead Eye, however, is trying to hard to be a bad ass. King Shark is just silly. Could be good, but by Issue one's end Harle is the only part about this looking good.

#3Justice League # 1
Pretty good set up, characters are all fun, and the art and build up are all pleasant. While nothings amazing, I'm looking forward to number two.

#2Teen Titans # 1
Same as justice league, only more so on all counts. It feels like more has happened, and the characters are all funner and more interesging. Art is nicer too. Really it's point for point Justice Leagues superior based soley off Issue # 1.

#1Death Stroke # 1
Deathstroke is a Bad ass. Slade will forever own your soul due to his overwhelming awesome. Issue one has some very well done action scenes, great Dialogue, and a freaking awesome end to issue one, both solidifying Death Stroke and his awesome, as well as setting up for something big.