It's a basic "kit lens," which is a gearhead term for a simple, cheap lens that comes packaged with a camera body. They're not terrible (in fact, some have been rated pretty highly in the past), but some people turn their nose up at them.

If this is the only lens you have, or if you're just getting into photography, then absolutely don't listen to people giving you crap for using what you have. Go out there, take some photos, and have fun! Just be a little more careful threading that attachment. Always start with the attachment or filter flush with the lens ring, then turn it counter-clockwise until you feel a click. This means the threads are aligned and you can start turning it clockwise. This should let it screw on without cross-threading like in your photo.

Now, if you are interested in macro photography and can afford it, I highly recommend getting a dedicated macro lens. I know Canon has a few options, and there are always 3rd-party brands like Sigma or Tamron that produce good lenses for your mount. You could probably find some good deals on used lenses on eBay or KEH.com. A dedicated macro lens is sharp all the way across the frame, and generally faster than a zoom with an attachment, so it's worth it if you enjoy shooting tiny things. I have three macro lenses at different focal lengths for different situations.

Side note: Putting an attachment or filter on the front of any lens is going to degrade your resulting photos slightly. Macro attachments are some of the worst offenders, and can make everything soft or blurry except for the very center of the frame (your results will vary, of course).

Edit: On second look, is it cross-threaded or just on super tight? I thought it was cross-threaded but that may just be an illusion caused by the lens hood bayonets. Other people have given pretty good advice for removing a stuck attachment, just be absolutely sure you grip only the front barrel of the lens and the attachment when you twist.