I kind of disagree with two points posted here:
Fairies:
Imho, looking at the typing itself, I still think it completely deserves the hype it got, and we even have a perfect example that showcases it: Azumarill!
It easily jumped from being an average UU-Mon to being a menacing OU-Mon, nearly solely on virtue of the Fairy-Retyping.
The reason why Fairy seems overhyped is because most pokemon with it have either unfitting or outright bad stats.
Sticky Web:
Again, the move itself is just ridiculous; And again, the reason why it's not used isn't that the move is bad -it's basically mandatory to run it on everything that gets it!- It's just that the pokemon that get it are terrible and on top of that are mostly suicide leads, a playing style that took a huge blow with new, better spinners, as well as defog. The only mon that could be used as a bulky setter is shuckle, and shuckle is... well, shuckle.
At least these two points seem to me like mocking people for not knowing what couldn't have been anticipated, which is kinda pointless.
Well, anyway, I have a few things myself that I think were underhyped:
Mega-Venusaur:Great typing, at least in conjunction with thick fat, great bulk, decent SpA, Leech Seed, Giga Drain and Synthesis easily make up for the lack of leftover, Poison-Stab ensures that the only type immune to leech seed, grass, can't really stay in(with the exception of ferrothorn)... It really was a lot better than even I thought it would be. Even without rain-support, it can easily wall many fire-types, and with it, even more, which is simply hilarious( I know, with rain-support, nearly everything neutral to fire can wall it, but if someone told me in gen 5 venusaur could easily wall fire in gen 6...).
Rotom-C: I already thought last gen it was underrated, but now, with the nice extras both grass- and electric-types got, it's even better, and additionally, opposing rotom-w absolutely hate it.
Actually, grass-types in general were somewhat underrated because simply being immune to spore-based moves makes them a lot more useful, and not many people seemed to be accounting for that.
Rotom-H: Unique typing - it's the only usable mon that resists boltbeam, it completely fucks over mamoswine, etc. - , immunity to arguably the best status-move while able to use it yourself, decent defenses AND the most important thing, with access to a lot better spinners and defog, the SR-weakness isn't nearly as bad as it once was.
Weather: Drizzle + Swift Swim is still just great, as well as Manaphy, and everyone is so grumpy about the weather-nerf that they neither try it themselves, nor prepare for it. On some occasions, you're even happy about the rain ending because it means you can use fire-types on a rain team outside of using it solely as a drought-counter.
Fairies:
Imho, looking at the typing itself, I still think it completely deserves the hype it got, and we even have a perfect example that showcases it: Azumarill!
It easily jumped from being an average UU-Mon to being a menacing OU-Mon, nearly solely on virtue of the Fairy-Retyping.
The reason why Fairy seems overhyped is because most pokemon with it have either unfitting or outright bad stats.
Sticky Web:
Again, the move itself is just ridiculous; And again, the reason why it's not used isn't that the move is bad -it's basically mandatory to run it on everything that gets it!- It's just that the pokemon that get it are terrible and on top of that are mostly suicide leads, a playing style that took a huge blow with new, better spinners, as well as defog. The only mon that could be used as a bulky setter is shuckle, and shuckle is... well, shuckle.
At least these two points seem to me like mocking people for not knowing what couldn't have been anticipated, which is kinda pointless.
Well, anyway, I have a few things myself that I think were underhyped:
Mega-Venusaur:Great typing, at least in conjunction with thick fat, great bulk, decent SpA, Leech Seed, Giga Drain and Synthesis easily make up for the lack of leftover, Poison-Stab ensures that the only type immune to leech seed, grass, can't really stay in(with the exception of ferrothorn)... It really was a lot better than even I thought it would be. Even without rain-support, it can easily wall many fire-types, and with it, even more, which is simply hilarious( I know, with rain-support, nearly everything neutral to fire can wall it, but if someone told me in gen 5 venusaur could easily wall fire in gen 6...).
Rotom-C: I already thought last gen it was underrated, but now, with the nice extras both grass- and electric-types got, it's even better, and additionally, opposing rotom-w absolutely hate it.
Actually, grass-types in general were somewhat underrated because simply being immune to spore-based moves makes them a lot more useful, and not many people seemed to be accounting for that.
Rotom-H: Unique typing - it's the only usable mon that resists boltbeam, it completely fucks over mamoswine, etc. - , immunity to arguably the best status-move while able to use it yourself, decent defenses AND the most important thing, with access to a lot better spinners and defog, the SR-weakness isn't nearly as bad as it once was.
Weather: Drizzle + Swift Swim is still just great, as well as Manaphy, and everyone is so grumpy about the weather-nerf that they neither try it themselves, nor prepare for it. On some occasions, you're even happy about the rain ending because it means you can use fire-types on a rain team outside of using it solely as a drought-counter.