Are there any of them left for you?
For me it'd be Resident Evil and Silent Hill, I guess. Resident Evil took a turn, and I sometimes miss the way of the old games, but the last two games were still loads of fun in a different way. Silent Hill has only cranked out great games afaic. Silent Hill 5 was a bit of a letdown to me at first, but I've appreciated it more on my second playthrough.
Main Mario and Zelda series also has great consistency of quality.