Again, not really, in my opinion.  Don't get me wrong---towering a mind-boggling 700 feet over the Atlantic at their highest point, there's no question the Cliffs of Moher are impressive.
The problem is, the tourist complex built around them is distracting and keeps you at a distance from the majesty of the cliffs.  Because of that, you don't really FEEL the height, you get a very pale and sanitized experience, and are besieged by tourist crowds pouring forth from the seemingly-infinite buses.