Your shrubs do appear to have significant damage.  Do you know what kind they are?  They could have been damaged by severe cold weather or lack of adequate water during the winter, or other reasons.  

The decision whether to remove or try to rescue your shrubs involves balancing multiple factors.  They may take a long time to recover from their current condition or they may not be able to ever recover, they may not be the right plant in the right place for your yard, etc.  Here is some information about how to decide whether to try to rescue or remove a shrub. 

"The cold is just one part of the puzzle when shrub health declines. Other factors include soil pH, soil volume, too much or too little water and light availability. Some shrubs may just need a good pruning and time to recover from the winter stress. If you want to try to revive the shrub through pruning, you’ll need to trim it down with sturdy pruning shears. Don’t remove more than one-third of the plant in a season. If the plant is healthy, it will soon produce new green shoots. If your shrub has more brown branches than green at the core, it may be time for you to remove it. When shrubs become too woody in the middle, start over with another plant.
Well-established shrubs may have large, complex root structures. Make sure to completely remove them before planting something new."

The Gardens in a Box from Resource Central are really great and might be a good alternative to your shrubs.  Most problems with plants are from environmental conditions rather than disease, and your shrubs look like they have suffered more environmental damage than disease.  
Thank you for your inquiry and best of luck with your shrubs.