[inghoff]

For quantities, yes, but for ratios, I'd prefer pie charts and knobs.

"75%/25% odds" would be nicer on a knob display, for instance.

[jowiar]

Not really for ratios. If there's a min and a max, sliders make sense.

You can make a better argument for a knob if you have an unbounded range, or an effectively unbounded one (making small adjustments on a large scale). Think old iPods.