1: No experience per unit, destroying a large army fields as much exp as only killing the strongest foe.
2: Why should I build monuments when outposts are much better?
3: Ridicules monsters are not that scary. WoM did this better.
1: No experience per unit...
Not? I seem to get more experience from killing 4 fire shrills than 1 fire shrill.
2: Why should I build monuments...
They are protected by city borders, outposts are not, while outposts are fairly cheaper and quicker early game rushing, monuments provide a more stable area of influence.
3: Ridiculous monsters are not...
What are you thinking about, imagine I did not play WoM...
Some of the others are bugs, and should probably be reported in the bug section 
Sincerely
~ Kongdej