I have to kind of laugh at some of the hyperbole here. Haken's first five in a conversation about the greatest first five in history (not every post has limited it to prog-metal) seems to me to be hard to defend, no matter how much you like the band itself, unless of course that is the only metric we're looking at.
QR's start is very, very good, no question.
But I think there is a legit conversation about at least 10 other bands:
- Led Zeppelin
- Black Sabbath
- Aerosmith (I suppose the first is a problem, but it does have "Dream On", their signature song)
- Marillion
- ELP (either counting "Pictures..." or "Works I")
- Iron Maiden (I suppose the first is a problem, but they do play a fair amount from that album to this day)
- U2
- AC/DC (depends of course, if you use "international releases" or "US only releases")
- Cheap Trick
- Van Halen
- The Cars (I suppose Panarama is a problem, but the two before and the two after are THAT good)
- Def Leppard (I suppose depending on your take, the first half or the last half are a problem, but both have their place)
- Bon Jovi
- Metallica (I suppose depending on your take, the first or the fifth are a problem, but both have their place in history)
Just for the record, none of those is actually my FAVORITE starter run; that's likely Kiss or Dream Theater. Only the latter belongs in this conversation; the former is just my taste.