We threw out Oracle and replaced it with S4/Hana.
Oracle worked, but was old and clunky and not easy to use. I'm pretty sure they threw some sort of license audit at us too.
I suspect S4/Hana is pretty good, but the contractors who are doing the work for us are terrible which makes SAP look bad. The problem is that we are a massive American corporation and the drive is to send every process possible to countries with the cheapest labour, so we've got what we paid for.