The answer to 'my hedge looks bad' is that there are several common causes, including overgrowth, pests, disease, or improper pruning. Symptoms may include yellowing or browning leaves, sparse foliage, or uneven growth. To fix the issue, you'll need to identify the root cause and take appropriate action.
If the hedge is overgrown, you'll need to prune it back to the desired shape and size. This is usually a DIY task, but you may want to call a professional landscaper if the hedge is very large or difficult to access. For pest or disease problems, you may need to use targeted treatments like insecticides or fungicides. More serious issues like dead or dying sections may require partial or complete hedge replacement, which is best handled by a professional.