I don't really hate modern games per-se, I just ignore them most of the time because they just don't fit my lifestyle.
#1 reason is because I don't have time for them. Modern games need hours and hours of dedication, and some of this crap requires a CLOUD connection, and it HARASSES you to play it if you don't visit once in awhile, even if you have a "free account". I have this problem with the games on my phone I use with Cricket's Ad It Up Program - I have to shut off notifications to get them to stop pestering me (not to mention AdItUp itself) to come visit my "homestead" because they "need me" or go "fight off the zombies now" or "you could win today" - like I care. Dragon Warrior does not harass me because I don't come back to Alefgard every damn day! Leisure Suit Larry does not beg me to come to the 386 because a hot chick is there and I NEED to get him to get with her! Gaming should be fun and unwanted stress free, not like a nagging parent or spouse trying to get you to do the dishes or take out the garbage. It's a bloody game - not a chore.
#2 Money - First off, AAA titles cost about $45 and require more hardware than I can afford right now, offering no more immersive experience to me than the older GTA titles or The Sims 2 did 10-15 years ago. So what's the point. I used to patron Scott Cawthon's FNaF Series because it was like $5-7 bucks per game, and the games were short spurt games (see #1). But my biggest annoyances are paywalls, DLC, and microtransactions. Playing that crap on AdItUp, even great old franchises like Angry Birds fall pray to it, and Im sick of playing games and having to close out six windows saying "get blah blah blah for only $0.99" - look, I'm playing these games to SAVE money, NOT SPEND money. So like Hell I'm paying some mobile developer $9.99 for a $10 game I'm trying to save the same amount of money on my phone bill each month by playing (when I can). Look, I'm cheap. My most expensive collection item is the $156 copy of Dragon Warrior IV, and I traded in a bunch of game stuff I did not play/use for it and paid not one dollar from my wallet. And it used to be anyway - when you bought the game, you got the WHOLE game. I would not be a fan of the NES if Super Mario Bros. told me I needed to pay Shigeru Miyamoto $20 to unlock levels 4-8. I would not play DOS games if Ron Gilbert was trying to ransom me in Monkey Island for Disks 64-125 just so I can see an arbitrary catacombs under a tree-stump! This is why I love old stuff. The only time I hit a paywall is when the puzzle is to find pieces of eight or grinding incessantly for a Broad Sword - which is a time investment, but I'm not being nagged and can do it on my own time.
#3 I'm old - I'm almost 40, I'm pretty set in my ways. I like 8-bit sprite, grindy, RPGs where all I need to do is cast a spell or use some item to "warp" back to the castle and save. I like old graphical adventures where I just navigate 2 steps through a menu to save my file on the local machine and not on a cloud that goes belly up in 10 years because the developer decided usership was "down". It impresses me such an open-world sandbox like Ultima VI/VII can exist on hardware that struggles to even render a basic 128K MP3 file, and let me bake bread, make it with a tavern wench, and cast Armegeddon with sweeping, world-breaking results! I like blowing 15-minutes on arcade classics like Pac-Man, Asteroids, or Space Invaders for no other reason than to kill time, or spending 9 minutes in a creepy Pizza Arcade with a bunch of homocidal robots at the most recent. I don't like worrying about losing my $15/mo cloud account, a pack of mean teens victimizing the elder gamer on the server when he's away, having games pestering me for money like some kind of digital parent who has a chore for me to do, or putting personal info out there about myself on platforms I deem "questionable" (I killed my Facebook last week).