Palmer is just a hodgepodge of random characteristics that 343 tried to call a character. If she had a side that humanized her better, I wouldn't dislike her so much. Spartan Assault's bonus mission F kinda helped, showing her respect and admiration for Davis, but otherwise, she's far from noteworthy.
I thought they showed a good side to her in her interplay with Laskey in H4. I think she's a good addition myself. By the book Spartan, to a fault. The negative reaction to her is extremely puzzling.