Admittedly, Diver Down is the worst of the 1st 5 - the covers are...weird. Van Halen were trailblazers, why they would want to do those covers is perplexing. The Kinks cover is a given but the rest... They were most likely bored, I suppose and wanted to experiment. Probably the same thing that happens to every great rock band. The reason I couldn't get into 1984 is that they wound up sounding like a band that's influenced by Van Halen - you can only blaze a trail for so long, I suppose.
I agree with you as far as Hagar goes. I didn't mind Sammy Hagar - of course, by then, my world was consumed by Iron Maiden and thrash...still, Hagar gets a bad rap - it's not 'hard' rock but it is good rock.
I used to have a picture of Van Halen with all their autographs. It was the first concert I ever went to. My uncle stood around with me for, like, 5 hours to get their autographs. It was in '86 though, when 5150 came out and it had David Lee Roth in it so we didn't get Hagar's autograph. Oh well, good enough, all I really cared about was Eddie's autograph anyway.
Shit...I could talk about Van Halen for hours...
By the way, I agree, Fair Warning will turn a fairy into a pack-leading alpha.