Flying around the wasteland doesn't seem to turn up a whole lot of evenly placed spawn points. From what I can tell the spawns are very specific to locations on the map unlike fallout 3 where the more evenly placed spawns lended for a better environment for random generation of mobs. From the looks of it if Marti was to port his mod over to Vegas right now as is we would find ourselves wandering empty wasteland then suddenly happening on giant clumped up battles in the places where we really don't want to see them happening.
Unfortunately I have to agree. There are large expanses of wasteland where no mobs spawn at all. And there are quite a large number of spots where the mobs spawn right next to fast travel points.
Some prominent examples of this are:
Bonnie Springs: Cazadors spawn right next to the fast travel point here. And while normally its only 2-4 and therefore perfectly safe, with MMM installed I don't want to think about how fast I will get mobbed if I dare to fast travel there. A pack of 10+ cazadors is DEF not something I want to fast travel into the center of.
Scorpion Gulch: Occasionally 1-3 Giant Radscorpions spawn right next to or on top of this fast travel location. Again 10+ Giant radscorpions are not something you want to fast travel on top of.
Ranger Station Charlie: For some reason Legionaries seem to spawn in this location a lot and while normally its fine because they just die to the NCR people there, with MMM installed this Ranger station will def get wiped out in a few short seconds.
El-dorado dry lake bed: Giant Fire-ants spawn right next to this fast travel point
Harpers Shack: Seems to randomly spawn Deathclaws on the hill right adjacent to the fast travel point.
Vault 11: has fiends that spawn and will attack immediately when you fast travel there.
In short if someone ports MMM to FalloutNV it will render a lot of fast travel points far too dangerous to just travel too. Im all for fighting my way out of huge masses of enemies but I would be nice not to land dead smack in the center of 10+ mobs.