It's odd how some things work out with improvising and some things are very unforgiving. I had a muffin recipe that turned out great when I left out eggs completely but in most things they are in the recipe for a reason. I did use oil as a substitite for some of the eggs in a cake recipe and it turned out perfect, moist and not-greasy. I got lucky I think because when I tried it on a different recipe it was greasy and not as fluffy. Yet another learning experience.