Sandile has it's moments (the Garbodor episode was pretty keen), but aside from that the show feels like someone's bland Pokemon fanfic where they just adapt walking around from the games without a plot or arc to speak of, with the Plasma plot (the most interesting part of BW) greatly minimized into nothing relevant or interesting.... Do you even watch Best Wishes?
The fact of the matter is that the main star of the Black and White games was N, despite him being an antagonist.
Black and White are his story - not the player character's, not the Gym Leaders, and not Bianca or Cheren's story.
And removing him from the proceedings is like basically trying to adapt a story by replacing an interesting main character with a very bland Mary Sue (I use Mary Sue in this way to emphasize a character who no longer has any flaws or any room left to experience character growth). The equivalent would be a Metroid anime without Samus Aran, a Legend of Zelda anime without Link, or a Mario anime without Mario etc. etc.