None whatsoever. +5 is +5, and whether that came from arcane magic, divine inspiration, or just being really good at convincing people, it's just what it says it is.Anyways, to the DMs: How much does the fact that the warlock cast a spell matter when you make your decision? At this point we're no longer really dealing within the bounds of human experience. Can he really talk his way through the gate?
That's the question, yes. How can I make his action useful without trashing the encounter?Somebody tried to use a skill and their head to get around an encounter rather than mindlessly bashing like people claim 4e is all about, no roleplay and only mass fighting, and it went to waste instead of the encounter going to waste..
As mentioned, it would be inappropriate for a single roll to cancel out the whole fight. Would you allow a fighter who rolled a crit to end the entire encounter right then and there? Of course not. He wounded one hobgoblin out of six. So similarly, a strong single check should probably have a similar amount of impact on the fight.
His high diplomacy check made the PCs telepathic?"The minotaur looks down on you, and starts thinking. To him it was just a job to guard this place, and he could care less who owned it or what he had to do for his job. But somehow he felt that, whether due to the intensity and earnestness of these intruders' pleas, or due to being vaguely aware of the whole scope of the danger caused by what he guarded, or perhaps both, his job wasn't worth doing anymore."

Anyway, you're making assumptions that the guards don't really care. What about when they do? What if they're protecting a beloved leader? Should King Richard the Lionheart suddenly lose all his guards because Guy of Gisbourne is a sweet talker? If these men are willing to die to protect their king, would any amount of diplomacy convince them to turn and walk away?
But at the same time, should Guy (assuming he's a PC) get no benefit out of his high check just because these guards aren't going to walk away?
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