Homemade shortcrust pastry is definitely worth the extra effort if you have the time. The key to good pastry is to use cold butter and water, and to have cold hands!
It's also really important to chill the pastry once it's made, ideally for an hour, and again for 30 minutes once it's been rolled.
125g butter
250g plain flour
1 teaspoon of salt
3-6 tablespoons of ice cold water