The left outlane can be fixed. Either Siamese post or cupboard bumper.
Set pitch to 6.5 or lower
Take down sling power and/or slightly bend leaf switches to reduce sling sensitivity.
Also, set co-op on for them to play. This is where the pin really shines for family. Or set it for 3vs1 where the grandkids play against you. Creates a sense of achievement where they can beat you.
It is a hard game. As hard as TWD. once you fix the outlane and the pitch it is bearable though. I also had to work on the right ramp a bit to make that easier.
If you hate it move it. But it is a great game.
EDIT: when I first got it. I hated it. Thought I had made the biggest mistake. BUT had pitch at about 6.7. Once I dropped pitch slightly started to be able to make shots. So I know how you’re feeling.