Yeah, basically that. I'm back at work in Windows land on a Monday morning, and pondering what sadist at Microsoft included these features. It's not hyperbole to say that the startup repair, and the troubleshooters in settings, have never fixed an issue I've encountered with Windows. Not even once. Is this typical?
ETA: I've learned from reading the responses that the Windows troubleshooters primarily look for missing or broken drivers, and sometimes fix things just by restarting a service, so they're useful if you have troublesome hardware.
I think it pointed out the right direction at least once, back when i was doing tech support (xp and pre-xp). Back when the toolkit includes whole stacks of cd's containing every driver known to exist. I don't even remember what it is, but it was something Realtek.