I've never heard of Air Master, but I don't think Oreimo is unoriginal in the slightest! Yes, incest anime has been done before. But the plot and the characters haven't! That's like saying Ouran High School Host Club and Amnesia are both the same thing because they're both harem anime. They have many different things that make them both very different!

Daybreak Illusion, though I am planning on watching it as I love magical girls, I have heard is literally Madoka Magica. Like, a complete Madoka ripoff. I can't confirm it myself as I have yet to see it, but if what a lot of people say is true, then...

^I've seen the first few episodes, a friend of mine actually watched the entire anime, this friend did NOT like PMMM but liked Daybreak Illusion. I also didn't like PMMM but did think Daybreak Illusion was pretty good (and that's saying something cause I don't usually like Magical Girl anime). They're both dark magical girl anime, and Daybreak Illusion came after PMMM, which is basically why people give it so much crap. Having the same genre does NOT make something unoriginal. Yes in both shows girls save people being taken over by dark feelings THAT'S GOES FOR A LOT OF MAGICAL GIRL ANIME. Spoiler alert magical girls save people, and Madoka was not the first one to do it. Daybreak Illusion has a VERY different art style from PMMM. It makes the characters and show in general a little less cutesy than PMMM. Aside from being a dark magical girl anime it also has a Tarot card theme to it. PLEASE watch at least one episode before you judge it, yes it's similar but it still holds it's own, it's not a complete knock off. They're really only similar in ways that in ways that most magical girl animes are similar.