For sure, they exist. But without knowing a comics fan to ask, how do you find them? Brand New Day in Spider-Man also has a title which suggests you can get on board there, and OK, for those three volumes you can...but then the numbering on the spines gives out, and questions about his past start coming through, and yes these days you can soon Google the answers to those things, but you shouldn't have to. Or Brubaker's Captain America run, which is in many ways quite accessible, but is again let down by confusing numbering on the editions - initially I saw a 1 and a 2 and read one volume each of Red Menace and Winter Soldier, when in fact there were two of each.
Morrison was generally a good sign that you can start with his run and - while he will reference what has gone before - you're not expected to need it. JLA was the first mainstream superhero comic I'd read in years, and I had no problems. But then you look at his current Batman, or Infinite Crisis, and anyone who dives in there is in trouble.