I'd like to explain my "Favourites" to anyone who cares. I try to add every anime show I've watched to my favourites. I also add a few other non-anime shows I like to my favourites.

If I haven't rated an anime show on my favourites, it means I either haven't watched all of it or I haven't watched it at all. Unrated shows tend to be the shows I plan to watch.

If I have an anime show rated with a decent or high score, it means I've watched every episode in the series, or it means I've watched the majority of the episodes and I'm taking a break while they create new episodes.

If I have an anime show rated with a low score, it means I watched some of it and I didn't like it enough to watch all of it.

So you may notice shows like Pokemon on my favourites, but it doesn't mean I liked those shows. If a show has a rating lower than 6 or 7, chances are I didn't watch the entire series because I didn't like it.