I did not mean to rank the list in any particular order, Alson.
I know the Assassin is not the easiest pureclass to solo with, but neither is it one of the hardest. Cash problems are virtually unheard of with a solo Thief-class, you get to have a Ring of Regeneration
right after the Prologue, Mencar screams from traps and multiple backstabs( made even worse with the Improved Ilynich mod because it enables you to have dozens of Potions of Invisibility), non-range attackers stutter to multiple dosages of poison from a constant flow of
darts from an Assassin to the point where they
cannot even move, spellcasters get royally messed-up by poison too, etc... ...
Truly is the Assassin a most devious class to play with.