Disappointing, there is no other word to describe this show.
Maybe “wasted potential“ would be also something that would come to my mind when i think of NieA under 7. From the characters to the broken humor: everything in this anime feels wrong and wasted, but let me explain it by going through it.

As the main character you have mayuko, a hard working independent young women, who goes to cram school while working two jobs to support her living.
The other main character is niea, a freeloading alien living in mayukos closet.
But even if this sounds like a fun idea with lots of potential for the characters to play off each other, in this case it is completely wasted.
Every serious or dramatic moment is interrupted by niea, every time someone is doing something interesting niea comes over and brakes the flow with a stupid comment or joke.
In the very next sentence the anime shifts back into the usual disturbed mood of drama and the characters behave like niea didn't do anything, sometimes they completely ignore what is going on.

To me this feels like someone didn't know how to use jokes,it is like they had a joke quota to reach for every episode, so they randomly inserted them in after the episode was done to get the joke ratio they aimed for.

As for the setting itself and the atmosphere there are many unexplained things in this show for example: how did the aliens come to earth, how was the first contact, what is with the alien class system and the hate towards aliens without antenna, why is mayuko supporting herself. Nothing is explained even the racism part against niea as an alien without a antenna or a “under 7” as they are called. They use this fact in the anime as a joke, niea gets insulted by other aliens and how does she react? Well, she calls them names and sticks out her tongue. That is how mature this show is. The entire show is about them living together in poverty with bad jokes poorly writing characters and no substance what so ever.

The art itself is OK, but there are times where it looks like a elementary student made the animation. It is worse than your average bad animation it’s on the same level as kill la kill and this does not help in any way. On top of that these drops in animation quality happen every time they make a joke/slapstick scene. But otherwise it follows the same lain/renmei style of characters and art, so this will annoy you even more if you are a fan of the visuals of serial experiments lain and heibane renmei.

I would not recommend this anime, go watch another anime made by yoshitoshi abe because this is his weakest work so far.

Also there is a creepy Indian man explaining stuff in the end of every episode