A kit lens can be a good tool to learn with - it's a basic wide range for scenics, landscapes, architecture, etc. It's also a nice alternative for lightweight travel. It's meant to be cheap, and light...some kit lenses are slightly better built than others. Most manufacturers have a very cheap plastic kit lens for their entry models, and sometimes a slightly up-built kit lens for their enthusiast models which might be part-metal construction, maybe a little faster, or with better glass design. Yours is a very basic, cheap kit lens, but that doesn't mean it's not capable of fine shots. Use it, learn with it, enjoy it, and as you get better you can move into other lenses that fulfill your needs...maybe you find you need more length, maybe you need more wide angle, maybe you need faster apertures, maybe you need a short or medium prime, maybe all of the above. The kit lens can help you figure all that out.
I bought my A550 without a lens, as I already had a collection built up - so I have no experience with the Alpha series kit lens. But I have an 18-55mm kit lens on my NEX, and I use it very often. I've got lots of manual lenses, fast primes, telephoto primes, etc, but it's still convenient to throw the 18-55mm on there for travel, all-purpose needs and casual shooting. I've used it at night, for landscape, for indoors, for performances, for wildlife - almost everything in a pinch.
Sony DSLR-A580 / Sony 18-250mm / Minolta 50mm F1.7 / Sigma 30mm F1.4 / Tamron 10-24mm / Tamron 150-600mm / Tamron 90mm F2.8 macro / Minolta 300mm F4 APO
Sony A6000 / 18-55mm F3.5-5.6 / 55-210mm F4-6.3 / 10-18mm F4 / 35mm F1.8 / 16mm F2.8 / via manual adapter, lots of Pentax K mount, Konica K/AR mount, and Leica M mount manual lenses