One of my biggest criticisms of Chobits and other similar robot wife themed manga is that Chi is a robot purely in name only. She doesn't look or act like a robot, and so it's EASY to empathize with the main character when he chooses to fall in love with her, because she's functionally no different than a very innocent and daft human.
Mina is different. She is truly a robot in every sense, and the author does not shy away from her very robotic features. Her face is a static metal plate. Her voice comes out of an audio speaker. Her metal hands are cold, and stiff. She doesn't pretend to have "feelings" at any point. She reiterates time and time again that she loves the main character because it is in her programing to do so.
And despite all of that, the author sucessfully makes us love her anyway. This is a true relationship between a man and a robot. It's very flawed, but also very heartfelt.
One of my favorite chapters is when the main character Takuma decides to form a relationship with Mina. His sister insists on coming over. In a panic, Takuma tries to hide Mina in a closet. But as he looks at her sitting in the closet, a sense of shame comes to him as he realizes what he was about to do. You stuff toys, furniture, THINGS, into a closet. He came to a conclusion that if he was serious about Mina, he needed to give her all the respect and consideration he would of any real relationship.
In a lesser manga, this would have been a generic chapter of comedic antics as a family member comes over and rummages through their things for the eventual gag reveal of the love interest. Instead, Mina and Takuma greet his sister head on, and have a direct, mature conversation about the nature of their relationship.
This manga is simultaneously heartfelt, warm, and endearing, somehow without feeling the need to shy away from or downplay the less appealing aspects of what it means to be with a robot. I highly recommend it.