Putting skillmonkey aside, because other classes can still dip into Rogue to get access to any skills they might want to be an excellent dungeoneer, that leaves us with this 'massive' DPS under theoretically ideal conditions. Which is to say low AC targets that you can reliably hit with your 3/4 BAB, a maximum of 3 times per round instead of the dippers four, and which completely loses all potency against undead, constructs and Palemasters.susitsu wrote:Being a skillmonkey is literally everything.
Quick answer while I'm at work? Put out massive amounts of ranged dps within 30 ft of your target as a melee character using weapons that do 1d3 damage with no focus or specs in them and crippling strike them while you're at it.
And the damage isn't even that impressive. 15d6 presuming you were insane enough to go pure rogue (DEX at that, not touching a pure 30 STR rogue with a 10ft pole), and generously assuming you'll hit with 2 attacks per round it's 30d6, averaging out to 105 damage. Let's add in a d6 from the base weapon as well for 113 average damage on two hits.
This is just straight up worse than a hasted (or quickened spell) warlock who is sitting on 15d6+15 per blast, averaging at 135 damage per round. And that's not to mention higher damage classes like the good ol' fashioned weaponmaster, who suffers the same weaknesses to constructs and undead as the rogue, but due to his STR based nature and access to Weapon Focus will still be outputting decent damage and not become a useless lump.
Then there's the matter of even getting sneak attacks in the first place, you mention a melee buddy but that's not always going to be available. We have effects like darkness and invisibility but they have built-in counters, so does knockdown or any other methods of forcing flat-footedness, which means that you might not even be able to start sneak attacking while other classes can happily keep nuking away without reservation.
And as the cincher, any tool the rogue might be able to use to secure an advantage, be it wand, scroll, potion or other UMD device, a class with just a nominal 3 or 4 dip into rogue can also use to nullify that advantage or gain their own advantage. So that's why I'm not quite getting where this supposed rogue supremacy of yours is coming from. Because if it's just access to a greater number of skill points I just don't see how that evens out the other deficiencies of the class.