Just how seriously alienation is viewed varies from judge to judge; only a relatively minimal amount of recognition has taken place at the official level, as reflected in State Statutes, where it is virtually non-existent.
Still, many courts do not consider evidence of alienation to be serious issue. If you intend to make evidence of parental alienation a factor in your case, be aware that in some venues you will have to mount an aggressive effort in order for the evidence to be heard.
I've heard some disturbing things about Dr. Richard Gardner. What does he say?
Here is what Dr. Gardner himself has to say about the various allegations that have been made concerning him:
Misperceptions Versus Facts About The Contributions Of Richard A. Gardner, M.D.