You need to be more specific about where the oil is coming from. If it's leaving a pool behind wherever you park, then I'd say it sounds a little nasty.
However, it could be coming from a loose (or leaky gasket) on the rocker cover and this isn't a major issue.
What type of engine is it? Is there oil swimming around where the sparkplugs are? Try wimping away the oil and then start the motor and have a good look to see where it's coming from and how much is coming out.