Okay, I think I've figured it out. New Super Mario Bros. was the one that started it all, as such it's a fresh take on the formula, but New Super Mario Bros. Wii is a point higher for me because of the perfect powerups: The Propeller Shroom and the Penguin Suit, which were always my favourite to use, though the feel of the game being the same doesn't add much for me. So what if we took New Super Mario Bros. and did literally nothing to set it apart from the other games? Well, then you have New Super Mario Bros. 2. So the gimmick of this game is... coins. Yeah, that's it. I mean having the Tanuki Leaf back was cool and all, but like... it doesn't change the fact that this game makes me feel almost nothing. Like yeah there's a few levels that make me think "oh hey, that one was pretty fun" but a majority of levels blend together just like the other two games. At the very least this one was completed really quickly so I could check it off the list, but I really don't have anything to say about it. Overall, just really uninspired and lacking creativity at all which makes for a game that is the literal definition of mediocre.