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It's easy, but only if you ignore the difficult bits (chapter titles) that are good for learning
There isn't much text overall in this manga, which on the surface makes it seem easy. However, the chapter titles are usually some wordplay on a Japanese proverb or idiomatic expression. The titles have furigana, but some are still difficult to look up because the wordplay puts a spin on the phrase. There's also at least one outdated kanji in there, as well as cultural references to things like the game of Go and the わらしべ長者 traditional folk tale.
Sure, you can opt to skip these titles, but that's where quite a bit of the humor comes from. If you're willing to work through these idiomatic expressions and wordplay, I feel that you'll get far more out of the manga than if you don't -- but this is precisely the primary challenge for a learner. This is why it's kind of hard to give a rating. If you learn what the chapter titles are referencing, you will get a lot out of this manga, but I suspect that most people aren't doing that, given the current difficulty rating of the manga ("10" as of now). If you let those go over your head, then there's not much learning content left, and you miss most of the references that the author is trying to make.
The rest of the text in the manga lacks furigana, so it's not the best choice for a beginner. It's not especially difficult, but again, as of this writing, the difficulty level is "10", and I feel that rating is severely misleading someone looking for a first manga to read. スーと鯛ちゃん would be a better choice in this regard.