I think you've just played too many games. You know how they work now, you have a sense of what's behind the curtain. You can see the way the dev is trying to talk to you through specific camera angles and lighting placements, and you resent it and wish for the days you didn't notice that stuff.

I get it. It's valid. But it's a personal thing. Games didn't get less fun, you just aren't enjoying them anymore. They've always been like that.

May I suggest cheating? No, seriously: Download some mods, cheat tables, or trainers. Play the game the way you want to play it. Break out of the devs' carefully-packaged little box, even if it makes the game easier or makes people sneer at you. Go out of bounds. Give yourself infinite health and see how long it takes to beat the last boss naked and unarmed or using a DDR pad.

Don't cheat in multiplayer though. There's a special hell reserved for those who ruin others' experiences.