Sure it is -- it gives you the equivalent angle of view of a 28mm lens on 135 format -- that' s a very workable wide-angle option.
When you get to 21mm and wider, as was suggested, is the realm of ultra-wide -- much more of a speciality lens... not a bad thing, mind you, but not as robust as the 28-65mm he'll get with this lens on a crop-body.
Also a nice future-proof lens -- upgrade to a 5D or the like and you now have an ultra-wide to (very slightly) wide-normal lens.