I have a lot, mainly Nintendo focused.
1. The SNES first party lineup is overrated. A lot of people act like their games are some of the best games of all time (Super Metroid, ALttP, SMW2: Yoshi's Island especially) for their IPs. I will say they're very foundational games that established many of the formulas for some of the biggest Nintendo IPs, but there's been other games that have built on those formulas that are better games.
2. The Wii U's platformers are far too rehashy. Almost all of them (NSMBU, 3D World, Tropical Freeze, Woolly World all feel like rehashes. Super Mario Maker is okay, but that's about it). They don't really add much of anything meaningful to the gameplay and mainly just feel like level pack sequels (a common theme for the Wii U platformers seems to be that they rely on various level gimmicks to try and shake things up instead of actually creating new mechanics that could improve the entire game). Really felt like the genre was in a creative slump until Mario Odyssey.
3. Super Mario Sunshine is underrated, it's really fun to use F.L.U.D.D. to perform crazy acrobatic tricks that can sequence break the game or come up with insane shortcuts through the levels. It's sort of like the Super Metroid of Mario games in that sense.
4. I see little issue with Yoshi's Island DS whereas Yoshi fans seem to feel like the game is mediocre/terrible. I don't really see it. It just feels like Yoshi, but expanded because of extra characters. I'm not as bothered by switching babies in Stork Stops like many other people are (except in 1-7, which was intentionally designed for you to constantly swap between it, that was certainly excessive), and other than that my only issue is that it's slightly on the difficult side but that could be a plus for some people.
5. Expanding on my point about Wii U platformers, Crafted World > Woolly World. Woolly World is somewhat of a ripoff of Kirby's Epic Yarn, just with Yoshi mechanics instead of Kirby mechanics, and while it has some unique levels, it was mainly same old Yoshi and I wasn't impressed. Crafted World, on the other hand, takes some legitimate steps to push the Yoshi formula forward, such as having 2.5D level design, flip side levels, and the ability to free aim and shoot objects in the background. I feel like if Crafted World had better level gimmicks it would blow Woolly World out of the water and this shouldn't even be a debate.
6. I'm not excited for the MK8D DLC and I'm actually crushed that we got that and we're probably not getting an original Mario Kart this gen. I'm sick of playing old courses and I want new Mario Kart content to play around with, it's been 5 years since I played 8D, I'm ready for the next big thing. God help anyone who played the original on Wii U because it's been even longer for those people, but 5 years since 8D is bad enough.
7. Skyrim is a mediocre open world game. The main issue with it is that there's no real incentive to explore the overworld, most of the game content happens in towns and dungeons, rendering the bulk of the massive open world largely pointless filler. Skyrim really needs a Korok Seed-esque collectible or more treasure at random spots in the overworld to really encourage you to explore every nook and cranny of its open world.
8. I don't think Nintendo needs to bring back F-Zero. Mario Kart 8 and its DLC tracks largely satisfy anything F-Zero would bring to the table and mechanically it just feels too similar to other kart racers and car sims. I do think Nintendo needs another racing series, but we need ones that involve different actions other than the typical drive/brake/boost/drift mechanics, those are oversaturated in the genre and there's far more to racing than that. Bringing back IPs like Wave Race, 1080 Snowboarding, or Excitebike or making a new footracing IP similar to Sonic R would be much better complements to Mario Kart than F-Zero.
9. Klonoa kind of feels like a budget Kirby in terms of mechanics (especially a budget Kirby 64). Klonoa can absorb enemies with wind bullets like how Kirby can swallow enemies... but he can't absorb their abilities, just use them for a double jump. And Kirby can jump infinitely without needing enemies to help him.
10. The Sonic Adventure games are overrated and I get sick of people asking for Sonic Adventure 3. There's far too much of the Sonic Adventure games that don't feel like they belong in Sonic games, and in fact it's easier to count which playstyles do feel like they belong in a Sonic game (Sonic/Shadow, SA1 Tails, arguably Amy and Gamma) than which ones don't. I think the games are mainly viewed through rose colored glasses because they're the first 3D Sonic games but they've done Sonic more harm than good.
11. I like the boost Sonic games (particularly the 360/PS3 version of Unleashed and Generations) more than the classic games. The problem with the Classic games is that the level design is typically designed to stop you and you probably won't be able to speed through them until you've memorized the level. Whereas with the boost games, you can speed through them no problem and the skill and challenge comes from maintaining your speed. The latter is just so much more accessible and encouraging. Also, I think 3D works better than 2D for speed because 3D allows you to see further ahead in the course and better react to obstacles.
12. Super Mario Galaxy is better than Super Mario Galaxy 2. Super Mario Galaxy 2 falls into the same trap as many of the Wii U platformers in that it relies a lot of individual level gimmicks. They're very good level gimmicks, but the game regresses in other ways, primarily by making the game more linear, both by reverting from hubs to map screens and making the levels more linear.
Might think of more later.