The first actress to play Viki also originated Niki and that performance was said to be good. With that said, Niki was written more and more over the top over time. When Erika Slezak first played Niki in the 80s the writing and performances were more subtle.
Days: Victor Kiriakis is not a character that should remain on the canvas as long as John Aniston can remain. It doesn't fit his character to pass away peacefully in his sleep. He never should have been able to make it to this grandpa stage. Same as Stefano. It completely dilutes their legacy.
It does feel the writers are writing them as an item out of obligation. MB and LW have a decent rapport but it does not feel like romantic chemistry and never have.
Which is another reason the way they are messing up the current stories is triply irritating. Since they didn't have the guts to break them up outright, it should have been a decent window of opportunity to explore the characters drifting apart for logical reasons and instead someone insisted that No. Carson must be the endgame.