The writers just don't think like you people do.
And you think like a writer? Funny.
Mijumaru is getting "focus" because it's going to be Ash's first starter. Starters ALWAYS get focus. And Mijumaru doesn't even have that much of it.
Mijumaru was crestfallen when Shooti didn't choose it as his starter, meaning it's blatantly obvious that it's a proud Pokemon, like Piplup, right? Man, looks like Staravia already beat Mijumaru to the punch on being Piplup 2.0, considering he felt the same way when Ash didn't choose him to participate in Roark's gym.
Mijumaru followed Ash around and sprung into action when the time was right because it bonded with Ash and wanted to show itself off, like Piplup, right? Man, looks like Aipom was a Piplup 2.0 even BEFORE Piplup! And then Gible became Piplup 3.0!
I mean, everything Mijumaru does obviously makes it exactly like Piplup in every way possible, so why shouldn't we apply these situations to past Pokemon?
As for being "cute", I believe that beauty is in the eye of the beholder. One person may think Kibago is "cute", another may think Mijumaru is. You can't flat out say "this is cute and will appeal to females while this isn't cute at all and won't appeal to anyone, period", it doesn't work like that. If females find Mijumaru to be cute, so be it; they can suck it up when it evolves. If females find Kibago cute, so be it; they can suck it up when it evolves. If females find someone ELSE [holy crap, you mean characters in Pokemon can catch OTHER Pokemon that the writers can then use as marketing devices instead of already captured Pokemon??! NO WAY! Yeah. They can do that. Don't stick to JUST Kibago and Mijumaru on this one, pal] to be cute, then so be it.