Part 1
So you have discovered that you are not as easily impressed by games anymore, that only really good games can keep you entertained. You long for the times of years ago when you played a ton of games and liked them all, something which has changed today. You ask yourself if maybe you're just burnt out on video games.
Video games work like a drug. While not as addictive and destructive as, say heroine, video games have similar effects. Hell, some people actually did destroy themselves emotionally or had their careers or family ruined by playing video games too much.
Video games, just like drugs and sex, stimulate the production of endorphine. The problem with drugs, any drug, is that they have diminishing returns, and the more you expose yourself to them, the more the quantity required to obtain the same effects increases. Drugs like heroine have toxic effects that linger in the body long after the euphoric effect has worn off. While the toxicity is eventually flushed by the body if left alone, the body just doesn't enough have time to flush it all out before the user needs a new dose. As the user takes drugs, over time the brain becomes numb to their effects, so the user needs a fix more and more often in order to stimulate the same effects, and thus the toxicity just adds up faster and faster up over time until it eventually causes organ failure.
This obviously doesn't happen with video games, at least not physically. However, the fact that the brain becomes numb to the effects of video games, still applies.
Someone who plays a lot of video games and from young age, is very likely to hit the "video game midlife crisis" very soon. Thing is, games that other people praise and have fun with, just bore you and you don't understand what are these other people seeing in them. You also notice all sorts of defects and glitches, maybe even what you consider to be poor design decisions, that don't seem to bother other people. Thing is you just hit your video game midlife crisis. It's normal...biologically speaking, your brain has become numb the influence of most video games and is no longer stimulated so easily into producing endorphine. On other hand, if your life = video games, well...you may be in big trouble and is highly advisable that you find a new hobby.
Perhaps you have noticed that there is almost no one over the age of 30 that still plays video games. Yes, there are but very very few in number compared to those under the age of 30. So what happens that makes these 30+ yo gamers just vanish? Well I just told you above. Added to this, people get families and start focusing on those rather than games, and is also easier to move from video games to family if you burn out on video games.
Part 2
You may have noticed that a lot of game developers these days are focusing on multiplayer games, that games with deep stories and meaningful dialogues, are almost extinct.
This happens because (see part 1). It's just much harder and more expensive to make games with such a great single player experience that it impresses current gamers, most of which are over the age of 20 and have been playing games since they were little kids and thus their exposure to the "drug" made them more demanding because (see part 1).
However, by creating multiplayer games, developers manage to cheat by switching the focus from their actual game, to that of something much more primal: Competition. Their game becomes merely a platform used for something that has existed since the beginning of time. Their game is much easier and cheaper to make and also the gamer finds their brain once again stimulated into producing endorphine because competition against other human players is always something interesting, we even like to watch total strangers compete.
Single player games fall short these days because of that over exposure to video games, and they become much harder and more expensive to make in order to impress most gamers, and most developers just say "Fuck it" and then they pop out some MOBA or, the latest fad, online FPS games, that are all about pvp and competition and bound to have some sort of success.