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: Magical Girl Lyrical Nanoha A's
YMMVs introduced by A's:
Designated Villain: Graham. For some reason some fans still believe that he's the one who gave Hayate the Book of Darkness. Which is not true, Hayate already had the book before he discovered her.
Jerkass Woobie: Vita, before meeting Hayate, was a jerk even to the other Wolkenritter as shown in the sound stages, and harshly rebuffed Reinforce's efforts to reach out to her. She who also the one who seemed to suffer the most from a life of constant fighting.
Love It or Hate It: The movie suffers from this greatly. Either you loved it for the visuals, Fate's development and Fate and Nanoha's friendship, or you hated the movie due to bland music and fight sequences, Yuuno basically being written out of the movie, Lindy and Chrono never getting any closure to what happened with the Book of Darkness as well as the fact that the Wolkenritter held onto both the Idiot Ball and the Conflict Ball just to make the plot work.
About the only things universally praised by all fans in the movie was the cleaned up visuals, fight against the Darkness of the Yami no Sho and Reinforce's device being cool. However, the first action sequence is also universally disliked by fans, good luck getting them to agree on the why of that, however.
They Wasted a Perfectly Good Plot: We never find out how Hayate reacted to hearing about Graham having planned to use her to seal away the Book of Darkness, or if she ever found out at all.
Kyouya and Miyuki are shown to be expert swordsmen in Triangle Heart 3: Sweet Songs Forever. One of the enemies their sister is fighting in A's is a sword master. Despite the obvious opportunity for a duel between Signum and either non-magical Takamachi sibling, the most significant event featuring those two in that season is Miyuki ribbing Kyouya about his love life.
Considering how much Vita prides herself on there being nothing in the world she cannot break, why didn't she ever seek out a rematch with Yuuno Scrya, the boy who — without any Device and lacking her centuries of combat experience — managed to fend her off entirely without even giving her the dignity of his full attention? There's no way that he wouldn't have infuriated her, and no way she would have forgotten or forgiven the offense to her pride. At the very least, she should have become the SECOND antagonistically snarky bane in his life, after Chrono.
On the other hand, Vita wasn't even using her full power against Yuuno, as she had to conserve her cartridges (she isn't using the Rocket Form that shattered Nanoha's shields). She did, however, manage to prevent him from casting the teleportation spell that would have enabled them to escape, forcing Nanoha to use Starlight Breaker to destroy the barrier and force the Wolkenritter to retreat.
However, later on, Yuuno does create a barrier to block the Bolt of Divine Retribution from Shamal when everyone else was scattering. The same bolt that tore through a barrier like wet tissue paper. So, it's very likely, from this scene, that Yuuno could have blocked Vita even if she had cartridges to fight.