I'd agree that they're overpriced... they are the Gibson of the amp manufacturers... If you're going to spend 1500 dollars on an amp you might as well go with a Mesa Boogie or Genz-Benz... or another type of boutique amp... I've been lusting after a Two-Rock amp... I played one at Sam Ash a few weeks ago and it had such a great balance in it's dirty and clean tones it made me forget all about getting a Fender SuperSonic.....
Overrated... no... Marshalls have their place in the tone world... and it's a pretty historic place at that... Anyone that's ever picked up a guitar in the history of music has most likely recorded through a Marshall at some point.