dominion 2 is just the greatest strategy game imo .
and i think i will even like it in 10 years .
the only other strategy game that comes close here is steel panthers world at war but it is a squad level tactical turn based game so expect being turn based it has nothing in common with dominions .
i personally like turn based strategy games with empire management like dominions most
hopefully you are already planning on dominions 3 .
i am [almost] perfectly happy with dominions 2 .
but seeing what a huge improvement dominions 2 was towards dominions 1 if you can make this with dominions 3 too dominions 3 will be even better than dominions 2 .
and i am sure you can do this
just adding again new nations , perhaps easier modding / map designing ( good example : the starcraft brood war editor , adding perhaps triggers / scripts for sp like give +1000 gold to ai at turn 10 , ermor ai ally with pangenea ai , etc . )
and many more customizeable options especially for sp especially customizeable ai difficulty :
you may chose custom and then you have sliders or whatever like the following :
ai bonus gold e.g. -50% - +200%
ai bonus resources -50% - +200%
ai gem income : halfed , doubled , tripled etc.
option : ai fight only vs human : yes / no
another editor program where you can select ai research priorities / block special spells etc.
make a priority list for rituals for ai :
then an example would be i select for abysia ai :
bloodhunt , high priority : ritual summon devils , summon ice devils , summon arch devils , forge some special items like blood thorn ....
this way i could program the ai like i would play e.g. abysia and give it +50% bonus in all sorts of income and would have a really challenging match knowing that the ai is really an almost as good opponent as a human