This seems like a decent thread for the type of nitpickery I'm about to engage in, rather than the GL review thread. The current title is (thus far) good clean fun, and I don't want to spoil it by being an aging fanboy jackwagon.
So here's my whine: For the last few decades, the "universe" of the DCU has gotten increasingly tiny.
In olden days, the Legion of Super-Heroes took care of the Milky Way, and rarely stepped foot outside it. Along the way, they established dozens, if not hundreds of alien races. Daxamites, Durlans, etc. - all planets within the Milky Way.
This was cool, because if there were that many sentient races in one galaxy, just imagine how many might be lurking in the billions of other galaxies out there.
Over the years, more and more races got added to the Milky Way ledger. Twenty-two planets from Vega. Thanagar. Rann (it's right next door!). And so on.
Again, cool. More races in the Milky Way means the potential for so many more beyond it, right?
And the Green Lantern Corps was where we got a taste of that potential. Xudarians, Korugians, Barrions, J586ians... they all showed off the promise of what was out there beyond our galactic neighborhood.
And in the old days, it was always just a taste. Green Lanterns rarely came together at all. Perhaps they passed each other briefly on Oa during a (rare) personal audience with the Guardians. Or maybe they were sent on a (rare) mission to help out a fellow GL. But they didn't travel in packs. They were lone wandering knights, patrolling their immense sectors as they saw fit, but always at the beck and call of the inscrutable whims of the Guardians.
That all ended during the first battle with Nekron, when the whole Corps was summoned for the first time. It was cool, but it opened the floodgates. After the Crisis, seven GLs were hanging out on Earth. After Rebirth, it was common to see dozens of them flitting about Oa for some damn reason. The universe, once an immense void with a few Green specks of light scattered about it, increasingly felt like it it was crowded with GLs.
It didn't help that writers, both for GL and elsewhere, kept muddling up the difference between "galaxy" and "universe." Every time writers grabbed for "representative" aliens across the breadth of reality, they kept reaching for Thanagarians, Coluans, Tamaranians, end other Milky Way stalwarts, forgetting that there are literally 100+ billion other galaxies to choose from. Other writers kept making the Milky Way intersect more and more GL Sectors, straining mathematical credulity.
More recently, a 21st century version of the United Planets has been formed in the DCU. Even though its membership is once again dominated by the same old Milky Way planets (Dominators, Khunds, Tamaranians, Thanagarians, etc.) it's apparently somehow got enough juice to take over patrolling 1/3rd of the known Universe (known by the Guardians, that is... that should be a pretty huge chunk). Darkseid only wishes he could establish that much universal dominion that quickly.
What I'm saying is, universes should be big. DC's is getting smaller all the time.
I told you I was an aging fanboy jackwagon