Kit lenses are an industry standard for new camera bodies and are best at straightforward types of shots that don't require much zoom, don't have a lot of action, and which have soft to normal lighting conditions. If depth of field is your thing, grab a portrait lens (has no zoom at all) and start snapping some nice shots of friends, family, and interesting objects.
What are the specs on your SD card? Specifically, what is the read/write speed? (what I want to know is if it is U3 or not)