FALLOUT 1 AND 2, especially two.
Its more diverse than OBLIVION nad man thats diverse.
For example:
There are these 2 cities Vault city and GECKO
Vault city has all the wealth and there are no mutants, while Gecko is poor and full of mutants who get this sleep in a leaking nuclear power station.
Now I need to get into the nuclear fallout shelter of vault city to find out where I can get the GECK (a thing that will save my village from drought)
I can
-negotiate a peace agreement between the two by repairing the offending nuclear reactor
-kill everyone in Gecko to please the dreaded 1st citizen of vault city
-do the citizenship test and be allowed in
-sneak in and fight my way out and in or
-murder everyone in vault city and walk in.
I chose the last option since it was easy when I had MKII powered armour that could deflect a rapid fire shotgun blask and a car with over 50 kinds of weapons in it which i stole from a gun dealer in a gamling town further south.
A throughly enjoyable game with COMPLETE OPEN ENDNESS.
Buy the trillogy today because its only 14.99 euro for all the originals.
Watch the intro to number 1
Watch the intro to number 2