Yeah, my playthrough is going to slow down quite a bit too - I'm currently in the early 30's, but I fear those are going to take a while now that I'm back to work :-D Still, though, the events going on make it all worthwhile.
I'm sure mileage may vary, but as far as what I was hoping for, this game has already far surpassed Jigoku in my eyes, both in animation quality and in what's going on. Maybe it helps I went all super route this time, instead of all gundam in jigoku, since those were also padded with a lot of EVOL events, and those grew fastidious quite fast...
I also don't mind at all fighting Sidereal a lot (though there have been plenty of other people showing up, at least on Super routes), I feel they have decent unit variety and talking grunts always make for better opponents than AI/monsters with their bleeps or roars.
Finally, while I was somewhat unimpressed with Genion/Genion GAI in Jigoku, I gotta say Hibiki's new stuff makes up for it and I'm growing to actually like him quite a bit now. Helps a lot that the others OG hang around as well, so I'm not feeling like I'd rather have them instead :-D
(I also did a turnaround on DX on stage 30 I believe, with the SR point to defeat a boss that runs at 30000HP, since it was its unupgraded satellite cannon that sealed the deal, along with Dix-Neuf's Buster Beam. Those two make an awesome pair of long range destruction during Maximum Breaks - though I broke it up to try out Nono, but I think they'll be back together before long)
Current Top Aces:
-Alto (first one, completely by accident too since I don't really have any affinity with him, but those MAPs came in very, very handy during early Gargantia stages),
-Hibiki (because I always use OG chars, like'em or not)
-Kouji (because Photon Beam spam during enemy phase),
-Tessa (because Tuatha is the actual protag from FMP, don't let no one tell you otherwise),
-Loran (even though I didn't use his MAP once, go figure),
-Lal'c (because Dix Neuf is plain awesome)
-and Ledo (because I'm clearly faving Gargantia this playthrough, gave him 10 weapon upgrades before anyone else).
Many others since stage 30 and the increasing number of enemies (even Katz/Hathaway, thanks to the sub-orders and route split bonuses...didn't field them once, too) but those were the first I remember!