Depends on how many points you put in it and what you have to give up.
Marines use alot of fear because they will be taking the Libby anways (hood, Fury, Force weapon) and because it costs some 10 odd points and is even good against marines with the -2 modifier.
Unfortunately, most other armies don't have that nice modifier and will likely be loosing out and having to spend a great deal more points, leave off certain key items (Rez Orb or Viel for a fear power, uh no) or not be very effective against any but Tau, and scattered guard.
So, generally speaking no. In specific circumstances (Fear Libby, Psychic Choir-iffy) maybe.
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