I know I said Countdown: Arena was like Secret Wars, but Salvation Run is like Secret Wars too. Only with less plot.
Arena was lots of heroes fighting each other for some all-powerful overlord whose name I've already forgotten. It didn't make any sense, because his whole point was to build an army to fight someone else in a different comic, and keeping all of them would have been far more effective than having them fight to the death and take whoever was left, but that would have made for a much shorter story, and we wouldn't have had the excuse to see different versions of the same character kill each other.
Salvation Run is a bit like that except that nobody is making anyone kill anyone else; they are doing it because they don't like each other.
It's more than halfway through now, and the entire plot up to this point has been: villains get dumped on a strange planet. Villains fight each other.
It has some nice art, though.