Poor Quality Graphics. Nothing makes a site look more amateurish than fuzzy, jagged graphics. If you are not into graphics, consider having someone else do them for you. Especially should your company logo and product pictures look sharp. No permanent cure for this little creature has been forth coming so one must be vigilant to check often.
Broken links reflect a lack of maintenance.
The link should be operable or it should be removed. Other chronic problems 3. Bloated or useless pages. No one knows for sure how these pages get this way. Maybe they just get moldy like the fuzzy green thing growing on the saucer in the back of the refrigerator.