So I'm playing both sides of a campaign. Started last night and played Aftermath and the first side mission.
Granted it's not tactically perfect playing both sides. The main reason I'm doing this is to brush up on the rules. I typically only play skirmish so there are a ton of things I never fully understood about the campaign, like building a side mission deck, etc.
I'm gonna say this though - Imperials have a HUGE advantage. At least in the beginning. Stormtroopers just seem to be rolling perfectly every time - and I've had my characters get annihilated by them in each mission I've done so far.