Several of the people working on PA literally worked at GPG making supcom, they had plenty of experience. The main problem is that the spherical map idea is total garbage and should have been thrown out after initial prototyping. It's just not fun or playable.
A good campaign, story, and all that crap is pretty essential for an RTS game. As everyone has been discussing lately, most of the players are casual. These things have to be there and they have to give people a proper idea of how to play the game and make it simple to transition to multiplayer in order to maintain a playerbase.
I haven't played the Nomad's campaign, or any of the coop missions, but I'm pretty sure they still aren't teaching people how to play properly. People could have made a good campaign and tutorials for FAF, but they didn't. The same people are making the campaign for Sanctuary, so I have to expect it will be equally lacking.
I'm also concerned that early access, without the campaign and tutorials and such in place, could be disastrous. People used to understand the importance of first impressions, but now everyone just launches unfinished games. If the new player experience isn't exceptional from the start then it's likely many potential players will try the game early, be unimpressed, and never come back. I know I never gave BAR or PA or anything any more chances after I tried them the first time and was unimpressed.