I didn't really care for it at first. After seeing the final episode, I thought it may be worth it to see the whole thing. A couple years back I got the DVDs for cheap. There were worse ways to kill a weekend.
I thought it was odd though, the way everyone was a pilot and a ground troop. Reminded me of the GIJoe cartoons from the 80s. I really wasn't sure if it was a conscious statement on the part of the writers to make future warriors completely adaptable. Or just lazy writing. "Eh, !@#$ it, everyone's a pilot and ground pounder. And a diver. And they snow board."
I'm afraid you have to chalk that up to the cliches of storytelling, like Captain Kirk leading every away party or The Unit's members being able to blend into every enviroment, the series wanted to explore every aspect of the war but keep the continuity of the characters
Making the main characters combined fighter pilots/ground soldiers simply opened up more story-telling opportunities. Some people questioned the realism of having such "multi-purpose" soldiers. But then again, it's supposed to be the year 2063, who knows how the military is gonna work then?