It really does. STAB on Psyshock is handy for special walls. Not to mention dat 4x Fighting resistance lets it counter every Fighting type not named Lucario and Cobalion if scarfed and switched into their Fighting STABS.
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Stab Psyshock and the occasional Poison Type you face (Venusaur as mentioned) is the only common benefit.
In a Baton Pass scenario Stab Stored Power.
But with that comes many disadvantages like Weakness to Dark (extremely common attack type with many amazing moves), Ghost (also very common), and Bug. Fairy neutralizes Bug and Dark but would be a resistance without Psychic.
Psychic is my favorite typing, and I'm happy Gardevoir is Psychic as a result, but I don't deny that Psychic is one of the worst typings in the game.
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