Anyway, after playing a few rounds here and there for different scenarios I decided to start as Pontus and I am having a really hard time.. I feel a bit like the important actors are the two Roman factions and I am just a little nuisance (which propably I am at most)

The thing is that in the military rating Pontus seems to be the strongest actually! Though I guess this is partly because of Pontus rather huge navy (which is of limited use as far as I can see), it still doesn't look like my army is so weak on paper. So what can I do to prevent losing every single battle with a > 5:1 loss ratio?
Has anyone got any tips on how to play as Pontus? Or is the only hope I got that the Marius faction plays good enough for Sulla having to pull his army back?
Also, is there any impact on who actually controls a region? Like, one region is controlled by "Pontus", the other by "Galatia" etc. Or is this just as a "useless" little detail and I am simply the head of the whole faction?