Fujiwara kun wa Daitai Tadashii is an extremely standard shoujo manga. There are tons of shoujo manga out there much like this one. Set in high school and entirely focused on the love life of some girl named Hitsuji who's supposed to be undesirable to boys, but in a relatable way, and then for some reason two particularly hot and popular boys become interested in her, and of course there's a love triangle. The characters are at least a bit unique and fleshed out, but it's nothing comparable to the really great shoujo manga I've read, meanwhile the situations and plot are pretty much entirely standard. Also as is common, the manga is so razor focused on the romance that everything else feels a bit thin as a result. The writing is at best just serviceable, and the art is sometimes nice, other times you might notice a weird looking hand or foot or some such. Again, all these points are pretty dime a dozen for the majority of shoujo.

I also want to discuss the title, "Fujiwara kun wa Daitai Tadashii," or "Fujiwara kun is Usually Right." Since I haven't read to the end, I can't tell whether the title is supposed to mean that Fujiwara really is usually right or if it's supposed to be ironic, that Hitsuji initially thinks he's so right, then later realizes actually he screws things up like everyone else. If the intent is the former, then it's some pretty poor writing on the author's part because boy is Fujiwara wrong on so many things, though I get the sense the audience is more supposed to think he is generally right. If it's supposed to be the latter, I don't have much confidence that the author is going to be effective at making that point, as there hasn't really been any foreshadowing to that idea nearly 30 chapters in. But who knows? I may be surprised.

Which sort of brings me to another thing I've noticed as an extremely common problem in this type of shoujo, which is it starts off with a particular premise, in this case, Fujiwara telling Hitsuji some harsh truths which she eventually comes to realize (at least in her mind) are right, and then that premise quickly is forgotten as the manga relies more and more on standard tropes and becomes more and more generic as a result. Along these lines, at some point, Fujiwara stops giving her advice, and the manga becomes mostly concerned with this love triangle which frankly seems out of character for Fujiwara who up until that point seemed too sensible, with his thing of giving "hard truth" advice. At that point I felt like the author was losing their handle on his characterization entirely, to be honest, as he kind of does a one-eighty from outright refusing to be in any relationship to so aggressively pursuing Hitsuji he's being rather unethical. But, so it goes with shoujo, since it's meant to be sugar for people with that kind of sweet tooth.

In summary: typical shoujo, with the typical flaws, and the typical reasons to read. If you really love shoujo it's decent. People more familiar with the genre but only interested in particularly good shoujo probably won't care to read.