I'm now at the end of CD 5 of the Michel Thomas Spanish for Beginners course.
One of the things I love is how he focuses FIRST on what I'll need most in a regular conversation.
For example, to teach present tense conjugations, he starts first by teaching me how to say "I want to do something" and "you want to do something," as opposed to presenting the endings of ALL the persons.
How often do we use "we" and "they," compared to "I" and "you" in everyday conversation? Not all that often! So why not learn the forms we'll use most, derive the principles, and only then start looking at the other forms? It makes all the sense in the world!