In reference to the actual poll -
I loves me some PJ, they have the legs but just don't have the impact. PJ and the Dead go in the same category - lifetime achievement awards, but not necessarily changing the paradigm.
Nirvana has been discussed ad nauseum here - let's just say that they WERE an important flashpoint, but that movement had been building for the latter half of the 80s; not to diminish them, but SOMEONE was going to be "Nirvana" - and there's rarely anything wrong with being the right guys in the right place at the right time, God bless 'em.
The Doors - ah, couldabeens, couldabeens....Morrison was a bit of a pretentious wanker, but that doesn't mean he wasn't a FANTASTIC frontman. "The Wasp", "Hyacinth House", "Not to Touch the Earth"...all unheard but fantastic. But to me they just lack some je nais sais qua that doesn't put them in the top slot.
Metallica - greatest American METAL band for sure, but I don't see them breaking out of their subgenre. Certainly belong on the greatest rock band list, probably at 7 or 8, maybe higher.
Van Halen - for good or ill, the defining "hair band" - top 5 for sure.
G'n'R - Appetite is clearly one of the top rock albums ever. The sad part is that's about all they got. Better than Nirvana, but didn't have the legs - hey Axl, let me thank your for letting your ego ruin what could've been one of the great bands!
REM - Objectively, they merit consideration. Subjectively - meh.
The Eagles - appear to have it all - the songwriting and instrumental chops, long and varied career, massive sales if not artistic impact. The only problem is that after listening to about any Eagles album, it's all a little too pat and calculated, and I need to listen to something a little more soulful than they are. Like Kraftwerk.
Springsteen - I had this debate with a buddy - he says BROOOOOOOOOOOSSSSS! and the E's are comparable to CCR, as far as one dominant guy running the show. And I say that may well be true, but the fact the Boss didn't credit the E's on his albums removes them from consideration all the same. Semantics is a beautiful thing when it's workin' for ya.
Really, I think it's pretty clearly CCR. Their songs are timeless (the subtext in just about any of their tunes has applied to about every admin since they broke up - talk about capturing the zeitgeist), and well-crafted, and to me they sound as fresh and as DIFFERENT as when they came out.
Overlooking the Allmans was a glaring oversight as well - forget launching Southern Rock, they pretty well perfected the whole "jam band" thing. About the only reason to bother seeing anyone else is because it's more fun to take drugs in an amphitheater than in your room while listening to Live at the Fillmore East.