I worked on a couple of large Oracle projects, and they were probably the worst vendor I've dealt with in the last decade. They had the potential to solve really compelling problems, but it was overshadowed by how poor their products were and the eye-watering costs.
Once you're hooked of course on their financial stack you have little choice but to remain.
I'm watching with interest the adoption of Workday as a replacement for Peoplesoft, and wonder aloud if someone will unseat them in their related product groups.