So far I've only gotten good endings (just finished route 2). Even got gigantic field barely even though technically the battle took 1:48, I think I killed the last enemy at like 1:44 so I guess that was enough.
I'm sort of disappointed in the villain of this route. Given dialogue, I'm wondering if somehow that neuzen guy or whatever is gonna end up being the main villain, his faked avatar taking over various people, initially father gregory, then gilbert in rain route, then naoki in nanoha route. A pretty big shot in the dark though. However, I was really hoping there was some more ingenious master plan behind grey chrismas. The story of naoki losing his mind and setting it free to demonstrate it's value just feels too simple for such a sophisticated sci-fi world. Also man how dumb is kou to not realize the priestess is makoto? I'm interested in where she got her fairy mech from so early on and I imagine she gets a route near the end. So far we have basically merc route, fenrir route, next will be goat route, then finally ark route, then I guess a route showing us the real threat but ending suboptimally and then a true route where it all comes together (perhaps focusing on agent and something about people being a recreation based on agents observations). Oh, I also predict eiji had a good reason for being busy fighting people all this time, probably something to do with the stuff he, his wife, rain's dad, and nanoha's parents worked on beforehand, possibly with Noi.
That's my uninformed prediction after route 2. Also really wish they wouldn't put important dialogue during fights. I can't read those subtitles and fight at the same time.