274 games over 10+ years.
Do you feel you have too many?
I would ask in what context is this question being applied? Do I have buyer's remorse? Do I identify spending issues? Addiction? Is my awareness of my library's size an influential factor in future purchases? A steam collection is digital - games neither consume physical space nor can they be sold or pruned back. A steam collection will only increase over time. I don't think of my library as being too big or too small.
How many of the games you have do you actually play?
Are you asking how many do I actively play? Or how many I have played at all? I probably don't actively play more than 1-2 games at any given time. I wouldn't be surprised if 25% or more of the titles have never been played; Most game purchases are bundles where I'll purchase a bundle for the purpose of obtaining 1 specific title for cheap and have 9 others thrown in as well.
How many of the games you bought do you have a lower value about them now that you have bought them and do not play them as much?
Again, is this in regards to buyer's remorse? Define "value". Would I have preferred to buy the game at a lower price? Or was the game something less than what I expected and likely would not purchase if I could go back? Very seldom do I purchase a game based on hype/anticipation of that game's release. I'm not the person who buys No Man's Sky or Kickstarts Star Citizen, for example. Most games purchased on steam are at a discounted price. There are a few multiplayer games I bought which I didn't get an expected play time out of; games like vermintide, Killing Floor 2... games that require friends to also buy and actively play. This was much easier to achieve with an active steam community which I was a part of during TF2's heyday; There were always people playing Killing Floor, Magika, L4D, etc.
There are a few titles that I own for the sake of owning a digital copy of that game: mostly BioWare titles; BG 1&2, ME 1&2, Kotor 1&2 as well as the Dark Souls franchise; I own most of these games from their original pc/console (physical) release, but wanted to have an updated digital copy. I bought them not intending to play them but should the urge arise, I'll be able to.
In regards to general relevance; all games fall out of relevance over time. Do I value a game like TF2 less today compared to 2007? Yes. Does that degrade that game's relevance back then? No. Does it change anything about buying that game or the thousands of hours it provided in entertainment? No.
If you're strictly asking if I was disappointed by a game not meeting my expectations at the time of purchase; The closest example I can give is The Division - The 'end game' was split between farming PvE gear/power and PvP (which was influenced by a player's gear). So as time went on, there were glaring issues that showed the game to be one not worth continuing (relative to the amount of effort I was willing to put into it). However, looking back; I was able to get a lot of play time clocked with some buddies, and the Dark Zone was redeemable at twink levels (which is what made the beta so much fun tbh). Did the game turn out to be everything I wanted? No. Did I still 'get my money's worth'? I'd say yes.
There are also games that cause physical discomfort over time; Motion sickness. This is sometimes caused by a mix of FoV, frame rate and turn/move speed in a game. Oddly enough, I felt these effects after playing Deus Ex: Mankind Divided but did not have this issue with DE: Human Revolution. It's a rare occurrence for me - sometimes I push on and finish a game (the effects usually diminish if I continue to play) but in this case I did not.
