The Caledonians have a *really* frustrating campaign, I've tried it a few times now and it's like a way more frustrating version of Epirus. The champion spam from the rest of the Britannic tribes means I have to cripple my economy building elite units or lose every battle (their basic clubmen and spearmen literally rout the second they enter melee with anything better) can't trade or make allies because of the diplomacy penalty, plus you have to deal with random plagues (which seem really frequent in that region), winter attrition, and bankruptcy. I really want to like them because I like their units, but their campaign is just not enjoyable to me. I had more fun playing 15 or so turns as Medewi, and that might be because my neighbors can't spam a high-armor elite unit against my basic starting units.
I'm not so sure I like the economy changes from 1.1, TBH. I seem to spend most of my campaigns in 1.2 skipping turns because I have no money to spend or my public order is horrible, or because I can't support enough units to attack whoever I want to attack.