This might sound insane, but I firmly believe that Usagi Drop is an anime heavily steeped in wish fulfillment. Instead of the typical fantasies were all familiar with, i.e., harem fantasy, power fantasy, it’s parenthood fantasy.
Rin is not at all like a typical 6-year-old. Typical six-year-olds scream, throw tantrums, refuse to eat, destroy stuff, shirk chores, talkback, lie, and are generally a nightmare to deal with. Rin does none of these things. Rin is responsible and mature enough that I would peg her actual age at around 16 or 17. She’s basically a dream child, which is why I mentioned “parenthood fantasy” earlier.
The fact that Rin and Daikichi have an atypical child-parent relationship doesn’t get explored in any meaningful way. There is never any conflict between the two of them. In fact, there is almost no conflict in this anime at all for Rin or Daikichi. Because there is no conflict, there is nothing driving any plot or story. I would actually argue there isn't an actual story to this show. It's just random things happening that serve as a vehicle for Rin being cute.
The animation and art are fine. I appreciated that this show did not draw every character as extremely attractive. The opening is bizarre, catchy and memorable.
I would have enjoyed this show a lot more if there had been more depth to the characters. Daikichi and Rin are perfect characters from the very beginning of the show with no room to grow as people. If you want to watch a show where the characters are always happy, and nothing bad ever happens. You will like this show.