If I were to go with genre, I think most error coins are on the over-hyped side. For specific coins, I have three. I do not understand the current fascination with Libertads or modern struck Peace and Morgan dollars. On the flip side, what do you see as underappreciated? I do not feel knowledgeable enough to answer that one. If anything, I am surprised that silver dollars don't generally have much premium to them while ASE's seem to regardless of spot price. The current spot price appears to have eroded the premium for Morgan and Peace dollars.
Lots of over hyped coins. I'll go with the underappreciated. And this is based on me becoming a coin collector in the late 1960's. Wheat cents were the thing. Anyone I knew that had any fascination with coins were excited to find a wheat cent in their pocket. And that was only ten years after their demise..... I never understood why that fascination didn't translate to the memorial cents when they stopped in 2010. I think the entire run of memorial cents is under appreciated.
Other than "errors", to me toned coins are over-hyped. Some of them are butt ugly unless you catch the light just right, but people are going gaga over them. Underappreciated is personal taste for me. I love hub transition varieties - there's a ton of them in the Barber series and some quite scarce - but almost nobody else cares. Which is fine.
Over-hyped? The list is endless! Toned coins (to me, toning of any kind or appearance is just so much damage, and it will almost always turn uglier the older it gets). Almost any coin, especially bullion silver, sold as "collectable" or "highly collectable," such as the political or movie character themed coins from small countries. Privy marks. The list goes on and on.
Over-hyped to me are every commemorative, ever. Okay, some of the older half dollars are alright, I guess, but other than that I would not miss seeing any coin that isn't meant to be used.
Maybe mintage numbers figure into it? LMCs ran much longer and regularly had numbers in the billions.
They both ran for 50 years, but I bet the total mintage for LMC is way more. Wheats had all but disappeared from change by around 1970 when I first started pulling them for albums, but 15 years later now for the LMCs and I still get a high percentage in change. Anecdotally not many 60s or 70s though; I think a lot of that is people pulling them thinking they'll make a killing in copper.
NIFC coins I don't believe are overhyped at all. They're a narrow area of collecting that is overly un-rejoiced by the collecting elite, who feel that only classical coins of the realm, that circulate, are worthy collectable items. Most non-collectors don't even know these items exist.
I get your point Greenie, they just don't do anything for me. I look at them as items the mints make to generate income. to be clear I am also not a fan of the non-stop quarter varieties either, so in that I am consistent.
Too many people are interested in "error" coins because when was the last Merc, Buffalo or Walker you saw in circulation, but anyone can pick up a cent and say "Oh, look, this looks different, I bet it's worth MONEY".
Real collectors aren't looking at what the worth of errors are; I couldn't care less how much I could sell for since I'm never selling. The ones constantly asking for values aren't collectors, they're simpletons who spend too much time on their devices and believe whatever they read.
As someone who is chases "best buy for the buck" junk silver, I can say that in the last 8 years or so (and many thousands of dollars spent), I've rarely won a Morgan/Peace where I got it for "spot". Most underappreciated in that realm seems to be the silver war nickels, Washington quarters, and Roosevelt dimes. The Barber's (all values) also don't seem to be held in that high of regard. Now I am talking purely in the silver sense, not rarity or numismatic value. My plan is to stop piling here in the next couple months (well, by adjusting my "discount" upward, the chances of winning auctions will go down). Then I will start digging into the hoard to sort things and "see what I got". I literally have no idea (outside of some bars and rounds) if I have any rarities, keys, etc. I just know I got them all at "in my pocket at 'spot' at the time of purchase", so really can't go wrong.
I been a collector more than half a century and never cared for the Barber series. I believe that I may own only one example.... And believe me... I got boatloads of examples of most all our coinage.
All collecting--whether coins, stamps, art, antiques, dolls, whatever--is collecting what you like. If someone is trying to convince you through hype that their goodie is what you like, then it is overhyped. "Collecting" because it will go up in value is business, not collecting, and whether it ever will go up sometimes depends on how hyped it was, whether by its producer or the public at large. Consider Beanie Babies.
Oh, another super underappreciated (or cheap to buy in my case) is the pre 1967 Canadian Mint sets. I think people are so used to the U.S. versions that they don't realize that the Canadian versions also contain their silver dollar, so I get these at a really good bargain price most times.
I'll just disagree. I'm not in business, I just don't 'overpay' for what I collect. Part of my plan is the fun I'll have going through all that coinage, filling books, checking for errors, rarities, etc. But at the end of the day, everything I have has 'alternative' value, unlike "Beanie Babies". As for "what you like", what's the point of "collecting" 200 of virtually identical coins (dates/mint marks aside)? Outside of 'rarity' or "look what I got" prestige why would you need more than one perfect example of each coin?