This is why many don't want to love her...
343i seems to be using her to replace Cortana. That's NEVER going to happen/fly with Halo Fans. Personally I like the Palmer character. She's no Cortana, Halsey, Arbiter, or Sgt. Johnson, but that's okay. Sadly she's going in too late in the franchize and when we've (seemingly) lost a very close characters in MC's life (Cortana and Johnson). Two characters they seem to trying to replace with one. On top of that, she's mostly seen in Spartan Ops and in the campaign, she's the baddie.
Bring Cortana back in Spartan Ops Season 2 and don't push Palmer on us. Who knows, we may learn to love her.