I would say it's a mix of our age and how games evolved. Games were simpler and shorter.
Many Games are unnecessary larger, demand a lot more hours and are full of fillers that are not fun, in order to extend length.
Personally I dont think my age has much to do with it, I can still lose myself in a game when I play a good one.
Every other game today is either open world and or filled with crafting, collecting, upgrading, different ammo types, etc. Not that I dont enjoy a good open world game, but theres a shortage of good linear action/adventure games. Much of the time in todays games are spent doing chores that arent fun and I often find myself bored. I think i read a review of AC3 where the reviewer wrote something like it was like Ubisoft thought that if you took something booring, like collecting feathers, and had the player do it 200 times it would somehow be fun.
I do get the feeling games used to be designed to be fun, by gamers. Todays games are designed to articially extend the playing time. Also they are more complicated without any good reason. FC6 has so much crap going on.
I started replaying gears 3, and its sooo good. Just one fun action sequence with barealy any crap inbetween. Like space marine 2. I played gears 4 recently, and there it seems they tried to prolong the game by making every enemie a bullet sponge.
There must be a market for old school games like this? Space marine 2 and wukong have sold like crazy.
Whole video is great, espacially shooting glowing lamps at 0.50.