Nowadays there are many peirushim that have been written on Mishnayis that are written clearly with full details and attention to all facets of understanding the mishna. Why is it that some people still feel that one has to learn "the Rav" (Bartenura) when learning a mishna just because that's the way it's been done for a few hundred years? Why isn't using the Artscroll Mishnayis or Siyayta Dishmaya Mishnayis which is much clearer and much more detailed than the Rav, more accepted and learned by Orthodox Jews?
Artscroll and Siata dishmaya are themselves using the Bartenura. Bartenura is concise, cover the Shass from brachot to Uktsim. is based mainly on Rashi and Rambam perushim. Is known as mastering the sugia. Had been studied beyun and accredited by Tosfot Yom Tov, Mel'echet Shlomo, Rabbi Akiva Eiger, Tif'eret Israel and all acharonim. If you have a question about Bartenura you can compare your reflection with the reflection of the acharonim.
E. g. Kehati does not help if you have a deep question, generally he avoided it intentionally because he is concerned by beginning level only. To appreciate the value of Tif'eret Israel, Siata Dishmaya, Tosfot Yom Yov, Bet David, Shoshanim Ledavid, Kol Haramaz, Hon Ashir, Mel'echet Shlomo, Rashash, Lechem Shamaym, Ets Chayim,, Nezirut Shimshon, etc, you need to know on what they referred.
Learning with basic classic perushim on mishnayot is learning talmudic rational thinking, learning how to build a Suggia. How to develop reasoning without digression and with strong logic associations. For this you need the help of the way of yun ("סולם ניצב ארצה וראשו מגיע השמימה") which begins by reading and thinking with Bartenura.
see- [http://www.jewishencyclopedia.com/articles/3171-bertinoro-obadiah-yareh-b-abraham] - an article written by (Rabbi?) Louis Ginzberg and I quote (from paragraph titled "Literary Activity")-
"Its excellence lies in the fact that he selected the best afforded by Rashi and Maimonides and gave this in clear and easily comprehensible fashion."