Are you satisfied with your charity’s Web site? Is it as simple to use, informative, and polished-looking as it could be?

If you answered “yes”, you may want to think again.

The average charity Web site scored only 73 out of 100 on a recent survey of more than 2,000 visitors to nonprofit-run Web sites. That’s a low C, gradewise, and lower than government Web sites scored on the survey. Online banking sites scored 10 points higher.

The “Trends in Constituent Satisfaction with Nonprofit Websites” survey, conducted by ForeSee Results, in Ann Arbor, Mich., found two key problems with charity Web sites: How they work and the images they present of the organization.

Making Web-site visitors happier could significantly increase donations, the report’s findings suggest. Nearly 50 percent of site visitors who rate themselves as “highly satisfied” with a charity Web site are more likely to donate to the group.

“This is survey research, so it tells what people say, not necessarily what they really do, but it’s interesting nonetheless,” writes Jeff Brooks creative director at Merkle/Domain, an advertising agency that serves nonprofit organizations, on his Donor Power Blog. “And hardly surprising.”

What do you think?