They have a new melee system, including a combo system.
Maybe you should read more about DMZ, instead of blabbing without actually knowing something. :\
DMZ did die faster than the Alpha of ESF though, because the crashing and odd bugs was a annoyance to the new people.
So, right now, the Veterans are still playing the old version.
But just because they have bugs, which is going to be removed in 1.8 doesn't make it a bad game, by all means.