I missed the Gundam franchise altogether and maybe I'm late to the party now, but started watching this show with high hopes anyway. I tried watching retro mecha anime many times, but couldn't get myself over the retro look. I'm sensitive to art quality.
The Witch from Mercury looks stellar. The characters are pretty neat and it really reeks from atmosphere, the space scenes are particurarly atmospheric also the music is supporting it well. I was engaged from the beginning and will definitely watch this show for a longer duration. It's a mixture of mecha battles, campus slice of life and political intrique and a little yuri romance. Still on the positive side, there are no annoying characters, unnecessary drama, fan service or filler episodes and the male characters are cool too.
The battles are somehow not that stellar, even tough, there is one almost in each episode. Battle choreographies are simply not clever enough (watch The Expanse for what I mean by clever; even the end of the first Appleseed movie packed more gunpowder). Somehow the script is dumb. It takes on grand schemes, which is respectable, but then it falls short with the implementation, mostly in the "political intrique" department. Not ridicuolusly annoying, just a bit childish, like Suletta herself. I guess teenagers might be able to wholeheartedly enjoy it, but as a grown up adult I was constantly skeptical and smiling ironically. Maybe, this could have been an acceptable story somewhere in the 80's, but by today's standards, well... there are more cleverly written shows out there for certain.
Still, it reaches the bar, as long as my bar is concerned. I'm a big sci-fi fan, so I'm less strict with this one. I could complain endlessly, that characters are not polished enough, especially the side characters are neglected, they are just "being there", but the story moves ahead with a comfortable pace, it never gets boring and it always feels good to look at the screen. It's a bit flat and Suletta's and Miorine's relationship is not really going anywhere crazy or fast. I had the very same feeling with Angel Beats. Interesting enough to do not stop watching, it has a heart and can be loved for what it is, but wouldn't watch it again or recommend it to anybody as one of my favourites.
UPDATE: At the end of Season 1 it finds its fangs and switches gears to a darker and more serious tone (people starts dying, so the main issue is not who marries Miorine anymore... ;) ) which makes it way better, so I raised my seven to eight. Battles are still somewhat boring, but at least it's not duels now, but real war. I'm a bit more angry for all the script pitfalls and overdone scenes (didn't these guys know proportion?), because it could have been a masterpiece rather just being good. But it definitely has memorable moments, worth watching once.