I absolutely sucked donkeys at first. Even the 8-bit Super Mario theme song is pretty difficult when you're trying to read sheet music for the first time. It was pretty embarrassing, but I've stuck with it and try to play for at least 20-30 minutes a day. I also try to play on any piano I can find, and also try to play for anyone who will listen, just so that I get practice playing in front of people. That was actually remarkably difficult at first; my hands were literally shaking as I tried to plonk out a song. But, it's like anything. If you keep doing it you get better and better.
Here's the link to the sheet music: http://www.amazon.com/Super-Mario-Series-Piano-Easy/dp/07390...
The other difference is the definition of "good". There is no 90% in piano - you won't "win" at piano. You don't get "points" for playing a recital and there is no "#1 in the world". So I think "good" is relative when it comes to music/art whereas it's a concrete for sport/game. You might think "good" is "Playing along with my favorite recording" while I might rate "good" as "Able to play Chopin's hardest pieces".
A kindly woman in her late 50s with glasses that are attached with decorative chains that loop around her neck is preferable.
I've personally had tremendous success committing to work on something every day.
Seems like something like that should exist.