Most things that I've invested the time to try and make have turned out to be better than shop-bought.
Notable exceptions were my chocolate which was such a lot of effort for so little. Soap wasn't great. My spoons all warped (but, bless her, the wife still insists on using them.) Cassata - which sagged and turned out so big that most went off.
On the flip side, things that I wouldn't even think about buying in nowadays...
1 bread and rolls (with the exception of panettone)
2 biscuits (as in cheese and biscuits)
3 mayonnaise
4 yoghurt and cream cheese
5 jams and pickles
6 Xmas fudge
7 breakfast cereal
8 compost