^^^Obviously tastes differ. Personally I like my plots to make as much sense as possible. But if you liked Olivia (instead of Anna Torv,) it would certainly go far to improve the viewing experience.
The OP might observe that the ratings strongly suggest that far more people dislike the arc than like.
I did notice that. However, it appears the ratings have been generally declining from the first season downward so I wasn't sure what to make of it other than the general progressive fatigue that happens with all shows.