canon ef-s 18-55mm IS landscape

I used kit lens 18-55 mm on my canon 550D camera.

I was disappointed with basically all of my landscape pictures. Closeups were fine, but anything wide and 'landscape-ish' looked kind of bad. I was not using any filter and hood also. Please advise what's wrong here. Exif f/9, 55mm, 1/100 sec, ISO 100. Here is the photograph.