I believe this lens is a very workable "walk-around" lens, especially for a beginner/novice to learn with. The only caveat, and others have mentioned it, is that 28mm is not very wide on a crop-sensor camera. I just sold mine, which I'd bought used off eBay last year some time. I had it on my XTi and my 50D a lot. I thought it had very good color reproduction, quick AF with the USM motor, and with full-time manual, it was very easy to make minor adjustments to the focus. I bought a new Canon EF-S 18-135 for just a few dollars more than what I sold the used 28 for, just to get the slightly wider bottom end. I do mostly nature/landscape/wildlife photography, very little low light or indoors stuff so the 28's slight weaknesses there didn't bother me. The 18 doesn't have USM or full-time manual, but it appears to be very similar to the 28, except for the EF-S designation (the 28 is an EF lens and will therefore fit anything).
I'd say get one and check it out. I have no qualms recommending it, especially in its price range.