I liked that fallout 3 had all types of enemy's spread out into the wasteland including the super mutants i enjoyed shooting those green bastard but NV wtf only Black Mountain i hope i'am wrong but Black Mountain is the only place to find Super Mutants. i am dissapointed just like i was when i thought i found a tommy gun but i found out it shot lasers :sadvaultboy:
and yes i know about the nightkin but i like mutants that shoot back :gun:

Theres a SuperMutant village in the sky resort. There friendly but who cares?

Black Mountain, REPCONN, and Jacobstown. You may also find them randomly attacking at other places.

theres 2 masters near a camp fire close to bitter springs, just north of the ranger station

i've only seen ghouls at repcon and i've never seen mutants randomly places outside of Black Mountain

The Mutants are in the REPCONN Basemant. There are like 2 mines that have Super Mutants defending the area.

Then you clearly haven't done the mission that's in REPCONN.

Try discovering Jacobstown, it is in the mountains to the far west of the game map. You'll find a familiar friend from Fallout 2 there.

I've been to jacobstown an i've talked to marcus but i haven't done a quest from him and I've only played fallout 3 and New Vegas

Also, there are some Mutants at Jack Rabit Springs, Bitter Springs, and Bloodbourne Cave

The quest for Jacobstown can be obtained by going inside the resort and talking to Doc Henry in the back of the building.

The ones in the REPCONN basemant are nightkin. Anyways yes they can be found in Jacobstown although they are all friendly there.

You'll see quite a few, just give it some time.

Overall you seem to find very few ghouls and super mutants compared to FO:3
Most of the enemies are normal humans but differ do to the various factions.