I still think that Gargantia is a solid 8/10 overall for me, but it's the most likely of Gen's recent works to go down the memory hole for me.
Even now, my only lasting takeaways for Gargantia are...
1) Chamber was an excellent and memorable character that went out in style.
2) It sure was
purdy.
Aaaand... that's pretty much it.
It was a good show, but not a very memorable one. Mind you, if it ever gets a sequel, that could change things.