It really depends on the person, this is a case by case issue and as we know all science about the brain is not exact and it will never be as it's one of the most complicated and misunderstood organ in the human body.
That said, just like people who don't need to take Ritalin will feel a massive advantage because it will make them overactive, kinda like caffeine, instead of calming them down when it's used by someone who has the worst case of ADHD.
But the bottom line is that it's still a stimulant made with amphetamine salts and it does overwork your heart and make you dependent on it because of the increased dopamine and serotonin it releases. Sure it can give people an advantage if they have trouble concentrating in their day to day tasks, but it can also make people who are more sensitive to it too nervous and make them play worse, like shaky hands as you mentioned. It can either make you more focused and less distracted, or do the exact opposite.
But the real issue is that the effects vary too much from person to person because it alters the chemicals in your brain, and it does cause massive dependence on its users.
Just my 2 cents as a former psych student.
@GLoRToR may have more detailed info on this.