Alexis is an interesting case. She was rudderless at first, saved by NLG’s acting abilities turning nothing into something and her ability to generate chemistry with pretty much everyone she was with- Luke, Nikolas, Stefan, Ned, Helena, Jax. I also enjoyed her with Sonny, mostly because I knew it was not going to last. I loved when she and Luke would plot against the other Cassadines/Helena.
There have also been whole periods of time on the show when I felt they were basically ignoring her.