Originally posted by Adam Probably because it's 3x (ish) the cost and about the same otherwise.
That's one of the things you have to watch out for. People who pay a lot more for their lenses, often expect a lot more. People who pay a little are often thrilled with what they get for their money. Getting good lenses is an exponential thing. A DA*16-50 isn't 5 times better than an 18-55, but if you want that little bit extra, it costs a bundle. Never believe an expensive lens is as bad as its rated, or that an inexpensive lens is worse than an expensive lens in any relationship to the cost. A good lens will be a little bit better. Bargains are found when you realize a cheap lens is good for what you do. It may not be good for everyone, but if it does what you need it to do, it may as well be rated a10 for you at least. Unfortunately other reviewers can't possibly rate a lens for you. They can only rate it for themselves. If I cared about ratings, I would have sold my 18-135 years ago. As long as it works for me, why would I care what everyone else thinks?
With the more expensive lenses, one bad review can pull down a lens's rating an awful lot.