Lol, When I first started learning to play guitar my Dad showed me the so-called power chord and he said something like "There ya go. You just learned how to play 80% of rock songs" Power chords are wonderful, and you can actually do a lot with them... sliding the bass not up a fret (a string) can give you a bit of a depressive feel, while sliding down the higher note (the D string) can give a sense of motion.
First song I ever learned on guitar
I believe any guitar teacher who has a student obviously wanting to play rock songs and does not teach the power chord as the first lesson is horribly negligent and responsible with said student getting fed up with lessons after a few months. Knowing all those open chords is well and good, but the power chord frees creative students to start writing songs now.
To this day I can't believe how many instructional books I had to read to find that one little magic positioning which allowed me to put music to all those lyrics I had written down.
They're not the only ones my friend...
4 Chord Song
My High School Music Director never had any respect for Rock n' Roll because he said that all you needed to know were 4 chords. He wasn't kidding.
You ask me, 4 chords is one chord too many
But, on that note- I-V-VI-IV is every pop song from the 90s. There's something wrong with a progression that managed to find it's way through Green Day, Bush, AND Matchbox 20