These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Deva Series
Crazy Awesome: Laura. When she trades spell notes with Nanoha and tries to come up with her own version of Starlight Breaker, Hayate considers the ensuing explosion to have been inevitable.
Genius Bonus: There are a few, but to the author's credit they are explained.
Growing the Beard: Path of Vengeance is rather good, but you can see a marked rise in quality in Academy Blues.
Les Yay: Despite the Ship Sinking listed in the main article, this is still a Nanoha fic, so the slack is taken up by Niranjana and Allina (with some very mild Laura/Noriko thrown in).