Re: Intimidate
Even in the real world, you can't always assess someone's danger by ther size, but in D&D this is doubly so. You're a 10th level mage and some brute walks up to you trying to intimidate you based purely on his muscle? Please. If he's your average thug, you could take him on in hand to hand combat. If not, you have spells to back yourself up. Same goes for most adventurers or merceneries PCs usually deal with.
Intimidate isn't about making people think you can injure them in combat.
Intimidate is also not what you use when you've captured someone and are making demands.
Intimidate is your ability to coherse others, through, similar to Diplomacy. Think veiled threats at future dates, think hinting at consequences, or knowing just how to talk to someone to make them afraid of the possible consequences.
Old Man Reynolds doesn't want to help defend the town from the orc invaders, and you need all the help you can get. You mention what the orcs might do to his daughter should they break the line, and he rushes off to help. He'll probably curse you later for manipulating him like this, but that's what I think of when I think of Intimidate. Things like "Our friend the Baron won't be happy when he hears about this..." or "What a sad fate to put your chilren in.." I think mobster type deals.
Going up to someone and saying "If you don't do that, I'll break your skull open," isn't really using Intimidate in my book.