Alright...
Games that get too much love:
Super Mario Sunshine, it has there's playthroughs for it everywhere and also Petey Piranha has gathered a lot of fanboys. 1. Just because there are a lot of playthroughs doesn't mean it has been a loved game. Haven't you heard the critics? The critics RAVED on Super Mario Galaxy and Super Mario Galaxy 2. As for Sunshine? It's known as the "black sheep" of the series. 2. The introduction of a single character does not determine how much the game itself is loved or hated.
Super Mario Bros. original, alot of music from this game is overused, also alot of people despise Goombas when they were actually my favorite enemy. Agreed with that. But since it kicked off the Mario series, it won't be getting any less "love" any time soon.
Mario Power Tennis, youtube is flooded with playthroughs of it. See 1. in my first comment. Plus, from what I heard, spin-offs not named Mario Kart are generally hated in reasons I do not know (maybe because simply it's not a platformer).
Games that get too much hate:
SMB3, sure it was well liked, yeah whatever, but when the newer Mario games came out, everyone dismissed SMB3 like garbage. Also, COD fanboys love to keep making fun of the graphics of this game. Everyone? People still rave about this game even today. There are lots of people who keep saying that this game was considered one of the best in the series.
SMB2, the new enemies introduced here get too much hate, I actually loved Snifit, Ninji, Ostro, Pidgit and Tweeter. Agreed with you
Super Princess Peach, a game that Peach finally could kick Bowser's ass, haven't you guys been tired of Peach being kidnapped? Then you should give this game more attention! Haven't heard much of this game, so I agree
Mario Strikers Charged, I think... yes