Coming from someone who became very used to the Minecraft controls, it feels like the jump mechanics are a little too sensitive.
As soon as you advance one level, you are able to jump again (by level I mean layer of terrain), and the jump height is almost identical to the block height. This allows for quick stair-climbing, but it doesn't feel "natural" without the slight delay. In a realistic sense, no one takes 1-meter steps without a pause between them.
Obviously, everyone has noticed this, but perhaps no one has complained. Am I being picky, or does this bother others as well?