This guide has some decent information, but it has a lot of flaws. For one, it's very disorganized; all of the guide is crammed together in one big paragraph, and there's no easy way to tell when each section begins and ends... and there's not even much in the way of sections, either. Your guide is mainly a bunch of assorted information about Dr. Mario, which isn't inherently bad, but it's unpleasant to read and look at. I think adding an extra line of space between each paragraph would make the guide much easier on the eyes.
I think your information is also a bit lacking. You have some great points that don't get brought up often enough, like "never use Dr. Tornado when you could get by with a Super Jump Punch", but for other parts, you simply tell us a fact about Dr. Mario, and you don't explain it or go into detail, like here:
"The Doc actually KOs pretty early. All of his smashes, his up B, and his f-air are awesome KO moves."
This is certainly true and I don't disagree in the slightest, but you just tell us and you don't give us any more information. When should each move be used? What are the properties of each move? Pros and cons? A beginner to Dr. Mario will look at this and either not learn anything because it's so basic or be wanting more information.
"Another thing to know, stage control is pretty important with Doc."
This doesn't convery ANYTHING useful. Why is stage control important with Dr. Mario? Are there any matchups/general character attributes in which Dr. Mario needs to place a greater emphasis on stage control? How can he achieve stage control? This is just a generic statement that won't teach potential Dr. Mario players anything useful about the character.
I apologize if I seemed a bit harsh. I think this guide has potential and you seem dedicated, but overall the guide is a bit poor and needs a lot of work.