To be honest I'm not really big Nami fan, but for me LA Nami makes more sence then original. Let me explane:
1. Original Nami was always showing her emotions, was smiling and reacting with anger;
2. When flashback in Arlongpark happened Oda,by Nojiko said that Nami never laughed, she didn't have any friends and etc. This statement made zero sence in manga, but case it was just begining of the story, I said OK.
Now LA Nami:
1. Actually play emotionless person, and that's why when she laughed at the end of 4 episode, this moment was really special;
2. Unlike original Nami she didn't betray Luffy, she even decided to watch how Zoro fight against Mihawk, when original didn't care at all.
3. LA Nami started to show more emotions step by step, which suit her due story.
Soooo in the end, I feel that only people who hate LA Nami are same people who hate Garp line, Kuro line and etc.