qComments (weekly) 

This addon shows user comments from wowhead.com to help questing.
It is a modified version of the original qComment addon (credits to ostap):

• The database is built weekly from wowhead.com (currently only with English quest name support)
• Comments are sorted by rating, highest first
• All data is loaded on demand to decrease memory usage
• Characters at a lower level will use only one database, higher level characters will use two databases
• Level requirements for each quest are shown

• no other addons required, just use the standard questlog to show the comments
• nQuestLog, QuestGuru or MonkeyQuest can optionally be used

• Open your default Quest Tracker or your QuestLog
• Press and hold down ALT key
• Click on a quest title
  -> Comments table shows up

• Hold down ALT key and click on the same quest title again

• Expand some quests in the quest frame (be sure the frame is locked)
• Press and hold down ALT key
• Move cursor over a quest name
  -> Comments table shows up

• While still holding down ALT key move cursor anywhere outside the questlog frame

• Release ALT key before moving cursor