The plot makes much less sense than before. Fights seem to be forced, as creators didn't really have much idea, what can be done in this season. There are fewer fights overall and fight scenes are kind of more in the background than before. The story with the elves and dragon are absolutely from nowhere, making the whole story even more nonsense. A number of miracles and lucky coincidences during the story have gone up to the ceiling, even for an anime. Don't get me wrong, I like how often anime story is "too perfect" or "too good to be true", but here it is done to the unhealthy level. As I'm usually saying, I'm watching anime to have a good time, not to point out every mistake in the story, so I didn't attach much importance to this fact.
The whole story has its happy, cute ending, however, it feels a little bit rushed, while the middle episodes of the season are just fillers and give nothing to the plot. I feel like the last episode could be split in two, which would be much better for the overall story. The story is also way too much predictable (still!), but I think I am used to it now.
The characters development in the last season is great. Louise is finally a "healthy" tsundere (if that's even a thing) and isn't anymore annoying, as in the previous seasons. They, with Saito, finally realize and show their feelings (as they should), which makes the whole thing much more cute and enjoyable.
Art and sound quality are high. We see some changes in the art compared to the 3 previous seasons, but they are really minor, sometimes hard to notice (I still like the old art a little bit more than the new one). The sound was great throughout the whole series and there's no exception in Zero no Tsukaima F. It builds up the tension correctly, it makes the whole anime much more attractive. Nothing to add here.
Overall enjoyment is high (surprisingly after 3rd season). In some ways I liked the fourth season the most from the series, but also I have this kind of melancholic feeling for the first one. Both have some flaws, both are good in many ways. If you are not a fan of the series, you wouldn't probably find this season interesting too. I liked Zero no Tsukaima from the very first episode and I don't regret any minute spent watching this series.
Another fine anime to my "rewatch" list.
