mawnansmiff, I understand, but I don't think we do the dead service by only speaking of their good. As I'm reading through this thread members are praising their music to the skies, but I don't feel that it belongs there. But you do. Our mileage varies.
AC/DC was inducted into the Rock'n Roll Hall of Fame in 2003. The RnR HoF is notorious for not letting in Hard Rock/Heavy Metal bands, but after years of catching grief they've slowly began to let in Heavy Metal bands who deserve to be in the HoF. ie. Black Sabbath, who should have been inducted many years before they were for all their contributions to the Hard Rock and Heavy Metal genres. At the time of AC/DC's induction it was not very common for heavier bands to get inducted, so that immediately tells me something about their place in music history and their influence on other bands. With over 70 million US albums sold (not including millions upon millions more world wide); it tells me more than just teenagers were/are buying their albums. AC/DC influenced a multitude of Hard Rock and Heavy Metal bands since the mid 70's, and help changed the course of both genres. So yes, their music does deserve to be "praised to the sky." It may not be to your liking, but it's definitely worthy of the praise. Millions up millions of people have made that clear over and over again.
Also to address an earlier comment; the Beatles wrote a bunch of cheesy pop songs that had catchy hooks, and I wouldn't call any of their songs complex at all. Not even in their later years. If you want complex then listen to bands like Queen, Kansas, Pink Floyd, Rush, Dream Theater, etc. or any other band that plays Progressive Rock or Progressive Metal.
AC/DC at no point ever tried to be a complex band, and pretty much kept to the same format for writing songs; much like the Beatles did a decade earlier with their music. Only AC/DC used a different song structure and played harder music, but for the majority of their music they kept to a format that worked well for them. If its not broken, don't fix it. Give the fans what they want. Whether its the Beatles, AC/DC or any other band; if the fans don't like it they'll let the band know. Obviously the fans liked what they heard, so why change?