QE's goals are not: 1) BB growth, 2) employment growth; 3) rise in share prices; 4) rise in property prices; 5) devaluation. QE's goals are: 1) rising inflationary expectations; 2) decline % rates (with respect to the state, ceteris paribus).
more abstractly, QE – it is an instrument of monetary policy. if you want to analyze the impact of QE on variables such as economic growth and employment, you need to isolate the action of others, фискальной политики.
the main variables are influenced by policy mix, not a specific tool. that's why, when media and commentators write about, what QE helped / failed, usually do not understand, what they write about.