Correct. He might come into a fight wearing something like light bleeding-edge military armor, but forcefield generators, enchanted armor, or anything of the sort? Nope. And he's human trending toward average in all areas that aren't mental. You also got his opinion on Auriga right, too - if his enemy is shrugging off blasts from the Panopticon like they're nothing and the weaker Servants aren't doing anything, he might pop the lesser dose of Auriga to give himself a necessary edge. He'll pretty much never use the bigger dose unless he's facing somebody on the level of a Galactus or the like, his enemy can only be defeated via raw brainpower, or some buttons are pushed that make him decide his life isn't worth as much as what would be lost if the other dude won (like threatening Silver Star or showing off tortured prisoners or whatever).
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Twostuck, Homestuck RPG: http://www.gamefaqs.com/boards/8-gamefaqs-contests/62168402