Golden or Silver GL? ...
I had Hal Jordan in mind, although the original was cool in his own way. I think it's true of many comic book heroes that they are better in concept than they are in execution, and any of the GLs would fit into that category. You could even argue that Superman has only rarely been used to his full potential, either because his writers were afraid to take risks with the established continuity (as in the silver/bronze age until COIE), or because they thought Superman had to be less powerful to be believable (Byrne and his successors). It's been said that Batman is the most fully realized of the major heroes, and I would probably have to agree, even though I am (and always will be) much more of a Superman fan.