old book wrote...
Loghain refuses a title, and at first keeps wanting to get away from Maric and the rebellion and back to his old life (or back to look for survivors, another kind of responsibility). On the other hand, he's happy to lead troops into battle, and does eventually grow up, accepting promotion and fulfilling his new responsibilities. His ambition isn't for personal glory; it's to see his country free. He eventually pursues that with full commitment (and of course it leads to his downfall in DA:O, making him a tragic hero).
Maric never grows up. People keep praising him as a "good man", but that's not really correct. He's a good boy, which is something else. In the real world he'd end up a not very successful salesman, or at best an athlete. Being physically competent, charming and good looking are his main qualifications. He'd only rise higher if he had family connections (which is why he got somewhere in TST). Maric would be a good friend and maybe a good husband (if you didn't expect him to take too much responsibility for the kids), but you wouldn't promote him too high, and as a coworker you'd find him frustrating and kind of a screw up.
I'm not sure where you saw Loghain's motivation as "to see his country free." Loghain accepts his promotion because of his friendship with Maric. He calls himself a "fool" and "mad" for even considering staying. He further states that he was "swept" up into a war that he "never" wanted to be a part of because of Maric's friendship. Loghain on his own lacks motivation to do anything for Fereldan.
My impression was that all of Loghain's decisions were based on his friendship for Maric. He stays because of Maric - not for vengence, not for Fereldan, not even for Rowan - only for Maric. Loghain never says anything that makes him appear to be a Patriot. He is for the cause because Maric leads the cause. He dislikes politics and states that. He disagrees with Maric about trying to get the other nobles to agree with their plans. Loghain is an excellcent strategist, but he lacks the charisma, motivation and restraint that Maric possesses. They needed one another to acheive greatness. Neither one on their own could have had the success they had together.
As far as Maric goes, being charming and good-looking goes a long way in politics. Having neither in a government where the leader is chosen will not get you far unless you take your position by force. Furthermore, I wouldn't see him as a poor co-worker at all. Maric sacrifices his own happiness and puts his life on the line for his duties. As a co-worker, he would be the internally unhappy guy who is friends with everyone in the office and manages to get the job done. He would be quickly promoted in many positions although Strategist would not be an area where he'd likely excel.