>No one has explained how a sledge hammer can replace stealth, subtlety, and skill with negotiation (and no, threatening them with a sledge is not an answer, anything worth negotiating with will just waste you for that).
Allow me the honor enlightening you.
A rogue dressed for a dungeon crawl will be covered in knives and anti-trap gear, plus his own supply of weapons. A sledgehammer can be disguised as a tool. So, we've covered stealth, as sledgehammers don't talk, make more noise than you force them to or engage in inter-party bickering. Plus, they rarely, when ever, steal from fellow party members. So, +1 to the hammer.
Subtlety: a lost art with a man covered in maneuverable armor, weapons and tools; to a tool, its a given - it will not be lying to people, nor trying to gain the upper hand in deals it makes. Its very much an honest device. +1 to the hammer, again.
Skill with negotiation? Easily done, once again, in the hammer's favor. A rogue requires either guile or a reputation, frequently both. A sledgehammer has an existing stock of legends, stories and folklore, all well-established by every in-game culture. It needs no boasts or bardic sagas - every major industry has use of them, in some capacity, so it has a wide skill set, or at least, wide application thereof. Rogues? Plenty of skills, sure - but not where it'll count the most: dependability, honesty, trustworthiness. Its got integrity, and integrity goes a long way.
>It's a retarded premise. If we had went with "wizards can replace rogues", we'd have been cooking with gas, but this is just stupid.
Wizards with sledgehammers? Now, we're cooking with gas.