Metroid. I know that is has kind of become a meme answer considering the series relatively low-sales and just how much of the hype is self-contained to forums and subreddits. But, seriously, it feels like the most consistent series, and the most fully-realized one to me. I would go as far as to say there's thing in Metroid that I seriously wish were implemented into the likes of Zelda.
Coming up to this after defeating a boss has to be one of the best directed musical ques ever and one of the fondest memories I've had gaming the past few years, and I don't even like Super as much as Prime/Zero/Fusion
I guess the second would be Mario since of the few Mario games I've played in recent memory a disproportionate amount of them have landed in favorite-games-of-all-time territory (Mario Maker 2, 3D World, Mario Kart 8, ... and Origami King isn't too far off either but that's mostly because I usually don't like things) but there's something sort of odd about Mario that I can't place my finger on. I view the sub-series so differently from the mainline that I think I tend to underrate Mario as an entire franchise, because I really look at the separate sub-series as their own franchises (Mario Kart, Paper Mario, Super Mario, etc) even if they are part of the Mario franchise as a whole (I would word it as being part of the "Mario IP" though).
