In 39 years I have never owned a camera that took great pictures.
In 39 years I have never owned a camera that took bad pictures.
I have, however, used a camera to make some great pictures and I have used a camera to make some bad pictures. The camera gets neither the credit nor the blame - its all on me. So repeat this 100 times: "It isn't the camera its the photographer."
There will be a learning curve with any camera you buy. Plan on spending time to READ & STUDY the Owner's Manual which is how you learn to use your camera.
Taking a couple of photography classes will be the best way to learn the basics of photography which are light, composition and exposure. Its possible to learn on your own from on-line sites but easier with actual classes.
Although the Nikon D3100 is often recommended, especially by those who own one or just by Nikon fans in general, I like to get into the economics of why the D3100 might not be the best choice when you decide to add another lens or two. The entry-level Nikon DSLR cameras - the D3000, D3100 and D5100 all require using Nikon's more expensive AF-S lenses if you want auto focus. The less-expensive Nikon AF lenses can be used but you'll have to manually focus them.
Suppose you really get into indoor available light photography. You'll quickly discover that the 18-55mm f3.5-5.6 lens that came with the D3100 just won't get the job done. What will is a fast prime lens (fixed focal length, no zoom) like one of the three 50mm lenses offered by Nikon. At $120.00 the Nikon AF 50mm f1.8 is sufficient for most photographers but it won't auto focus on a D3000, D3100 or D5100. For auto focus you'll have to pay $435.00 for the Nikon AF-S 50mm f1.4. In my world $315.00 is a lot of money just for the privilege of auto focus. Had Nikon included a focusing motor in the D3000, D3100 and D5100 you could have auto focus with the AF 50mm f1.8 and any other less-expensive Nikon AF lens.
I suggest taking a serious look at the Sony SLT A33 which uses Sony's Translucent Mirror Technology (TMT). This technology allows for full-time continuous auto focus whether you're shooting still pictures ot video. TMT also allows shooting at 7fps (frames per second) which is considerably faster than that allowed by the D3100. The SLT A33 also has 2D or 3D Sweep Panorama.
http://www.imaging-resource.com/PRODS/AA33/AA33A.HTM
http://www.alphamountworld.com/reviews/sony-alpha-a33-slt-review-alphamountworld
Sony bought the DSLR technology and manufacturing from Konica-Minolta and wisely kept the legacy Minolta Maxxum "A" lens mount introduced in 1985. Sony also included a focusing motor in the A33 so a Minolta Maxxum AF lens from 1985 can be used on the A33 and will auto focus as it should. A Maxxum AF 50mm f1.7 lens can be bought for less than $100.00 if you shop carefully. The Maxxum AF 70-210mm f4 zoom (known as the Beercan) is a highly prized lens that will auto focus as it should on the A33.
Another plus for the A33, in my opinion, is that it has Sony's version of Image Stabilization in the camera body so any lens used becomes an IS lens. That 26 year old 50mm f1.8 prime or that 70-210mm zoom will have the benefit of technology invented almost two decades after they were made.
This isn't possible with any Nikon DSLR because Nikon chose to put their version of IS in some but not all of their lenses.
At B&H - http://www.bhphotovideo.com - the Sony SLT A33 w/18-55mm zoom lens is shown at $749.99 and the Nikon D3100 w/18-55mm zoom lens is shown at $599.95 after a $100.00 Instant Savings from B&H. That offer ends 4-30-2011.
In my opinion the Sony SLT A33 is well-worth the extra $150.00.
NOTE: The "big brother" to the SLT A33 is the SLT A55 which is getting all the advertising from Sony. B&H shows it for $849.99. Here is a comparison of the two models:
http://www.digitalphotographywriter.com/2010/08/sony-a33-vs-a55-whats-difference.html Only you can decide if the additional features of the SLT A55 are worth an extra $100.00 or not.
These sites will help you learn about photography:
http://www.digital-photography-school.com
http://www.kamerasimulator.se/eng/?page_id=2
http://www.photonhead.com
http://www.illustratedphotography.com/photography-tips/basic