Please excuse my ignorance but am I using round nose router bits right?

I recently bought a set of Diamond Ball Router Nose bits from ebay which I intended to use to put recesses in a few wooden pen boxes I wanted to make. I have my first 'play' with them today and they hardly touched the surface. The only way to get them to look half reasonable was to route a groove using a straight cutter and then open it up with the rounded nose cutter. I'm using them in a router table and they have 1/2" shanks. Never having used them before, I just expected to be able to lower the wood onto it and slide along and gradually deepen the cut. Should I be tackling it a different way? A similar item is on ebay uk number 371205623580








Your advice would be much appreciated

Regards

Paul