Welcome! I agree with registering so that you can see the rest of the content here.

in answer to your questions:
1) Some disagree with Dave's "debt snowball" because you actually can pay a little less interest by paying off the highest interest rate first. However, paying off debt in Dave's debt snowball order does an awesome job in helping a person stay motivated and making great progress. Debt will actually be paid off faster if you are motivated to keep killing the next debt.

2) There is always the argument that some debt is "good" - Dave and the majority of those who follow him disagree and like the reduced risk of no debt.

3) Some disagree with the "no credit card usage" that Dave promotes.

4) Finally, many disagree with Dave's investing philosophy.

Overall, Dave does an awesome job of keeping people motivated, helping them pay off debt, and getting them on a firm financial foundation.