Chris W
The great thing about ad-hominem attacks - they make you look like a bit of an ass.
Most of the music I've encountered that was released between 1969 and 1976 (approx.) is complete and utter shit (the output of Mr.Gadd included) , with the only real high-points being the first couple of Black Sabbath albums, Klaus Schulze-era Tangerine Dream (and his first solo albums too), Lemmy-era Hawkwind (and Motorhead, natch) and Pink Floyd's "Wish You Were Here"[*].
After '76, things admittedly do start to get more interesting with the advent of punk, although I have a certain fondness for the likes of KISS, Ted Nugent's first couple of albums (the man himself is an arse, but by Christ he can play guitar) and most of Frank Zappa's mid-70s output.
Deep Purple I'll grant you - 'Machine Head' is an excellent album, and without their influence we wouldn't have had the NWOBHM explosion in the late 70s/early 80s (can't beat a bit of good, old early-80s cock-rock whilst you're bombing down the M1)
Opinions are like arseholes - everyone has one but you're not allowed to like the one belonging to the other guy. Now if you'll excuse me, there's some Berlin School electronica vying for my attention, and as a (former) semi-pro musician I take most things on their own merits. The majority of 70s stuff I don't like. Deal with it.
[*] - "Dark Side of the Moon" blows. So sue me.