George Stacy is a fantastic card, there is no doubt about it! One of the key issues with Response events is drawing them at the right time, and Captain Stacey helps manage this.
Being able to save cards for future use and play them as if they were in your hand is unquestionably effective in a game where you draw a new hand every turn. For a single cost, this is one of the best Persona Supports in the game; it was wise for the designers to target this card with Gwen's Obligation.
On top of all of that, George is usable in both Hero and Alter-Ego form, being able to save Events in any form.
I rate this card an S: The ability to extend your hand size and have Events on the ready is incredibly powerful and works with any build in any Aspect, all for a single resource.