It's because you don't read a lot of shoujo that you think this is 'one of the best'. At first this manga was alright, but then it went down to having a ton of drama just for the sake of having drama-- which irritates me to no end. In essence, it's a compilation of many shoujo cliches, with a rival that's dumb as a brick and an overdramatic sob story of a mc with a lack of character. Her meek and wishy-washy attitude gets pretty tiring
In the end, what I'm trying to say is to just read more manga in general and you'll find that this is a pretty typical shoujo.
do you have any recommendations?
For a gag comedy type story I'd recommend Wotakoi: http://www.mangago.me/read-manga/it_s_difficult_to_love_an_otaku/
For something with a little bit more depth you can try Tomodachi no hanashi, or Okashiratsuki (if you don't get it at first read the translator note):
http://www.mangago.me/read-manga/tomodachi_no_hanashi/
http://www.mangago.me/read-manga/okashiratsuki/ (<<actually I'd reccomend trying this authors other works as well)
Rot your teeth off, fluffy sweetness:
http://www.mangago.me/read-manga/once_again_i_d_like_to_love_you/ (one shot)
http://www.mangago.me/read-manga/majo_senpai_nichijou/ (slice of life)
http://www.mangago.me/read-manga/tonari_wa_nani_o_kuu_hito_zo/
http://www.mangago.me/read-manga/migihara_s_short/mpn/mpn_chapter-1853232/ (^^chapter orders are messed up for this one so select manually)
And something a bit eccentric (but hilarious and surprisingly wholesome):
http://www.mangago.me/read-manga/oh_lord_jesus/
I wouldn't say these are masterpieces or anything, some may even be cliche or generic but I think theyre all within the range of your good to average shoujo. My preference is sol but if your not too into that some more plot ish manga you could try are (I think these are the more standard shoujo):
http://www.mangago.me/read-manga/tsubaki_chou_lonely_planet/
http://www.mangago.me/read-manga/hananoi_kun_to_koi_no_yamai/
Gosh this is one of the best, if not the best shoujo manga I've read so far. And I don't even normally read shoujo mangas