If I count all the shitty games I bought for 2 Euro and all the Game Pass and Games with Gold games I would consider playing, then it's definitely a few hundred.
I got about 550 games installed on my Series X and I always delete games I've fully completed, so that number should be the minimum.
When it comes to games that are definitely worth playing I guess it's around 50-100 games that I really want to complete.







