I feel that I have gotten more selective with the characters I like. While the personality quirks/tropes I like remained more or less the same, I feel that it's harder to enjoy them if the storyline and the MC are lacking or not developed enough.
No, I only complete the routes of the characters I'm interested in. That being said, I sometimes complete all the routes if there's a locked true ending/secret character ending.
My favourite is Shiki from Scarlet Fate. I don't usually dislike MCs, but if I had to pick, it would probably be some of the bland MCs from older Voltage games.
It's important to me tha main characters have distinct personality traits. I can't enjoy the story otherwise. Which is why I feel it's a shame that most old Voltage titles have the blandest self insert MC.