Unfortunately, Coolidge has been ranked pretty low in terms of Presidential greatness (Lower than Bill Clinton, LBJ and in some cases Jimmy Carter !!)
See here:
http://en.wikipedia.org/wiki/Historical_rankings_of_Presidents_of_the_United_States
Take anything that Wikipedia has to say on this subject with a very, very large grain of salt.
Perhaps Coolidge is ignored because he didn’t manufacture a crisis to exploit. He had no war to fight. In my mind this would enhance his resume, but for those that rewrite history, not so much.