Eh. I'm kinda disappointed but whatcha gonna do. We already knew they were using the entirety of the 10 Ancients, the 4 Dragons, and the 4 Sovereign. So that meant we had 4 Mega slots already spoken for. That didn't leave them a lot of room to do anything new with. My biggest disappointment here is the Shoutmon line - I find it just...
really unpleasant to look at. But I also found the Xros Wars designs pretty uninspiring and off-putting.
Comparatively, I don't actually mind the Legend Arms inclusions. I think that's a neat way of referencing the group's heroic bent without forcing the entire thing. ShineGreymon makes a decent enough inclusion for an entire line, and with the rest of the Savers cast (minus Rosemon) making appearances in other Fields I was anticipating that.
So that leaves Gallantmon -- and while I'm fine with the Mega specifically (and we were getting a Royal Knight regardless, we all know that), I think Guilmon/Growlmon/WarGrowlmon just stand out a bit too much as Demon Dragons (or however they're categorized). I get it from the view of "these are heroic digimon" but in terms of variety there's more out there. Would've liked to see a little more lean into the "holy" and "heroic" aspects of the Virus Busters. Heroic knights/warriors or Holy beasts/things would have made it feel more rounded out.
So yeah. Ditch Shoutmon Rookie->Ultimate and Guilmon Rookie->Ultimate and fill that in with a bit more variety and that would've impressed me more. But as it stands...

. This and Metal Empire are my least favorite overall, Metal Empire feels too disjointed and this feels too cookie-cutter.