While Eddie Van Halen is a very good tapper, he's a bit of a one-trick horse. All he can do exceptionally is tap - at everything else he's merely above average. There are better all-round guitarists out there:
Buckethead, as you mentioned,
Joe Satriani (Solo Artist),
Guthrie Govan (Jazz guitarist),
Steve Vai (yes, him again),
Paul Gilbert (Solo artist, formerly of Racer X and Mr Big),
Jon Gomm (Solo Acoustic Artist),
Jimi Hendrix (If you havn't heard of him then go ask for your brain back),
John 5 (now solo artist, used to be with Marilyn Manson),
Yngwie Malmsteen (whom I personally hate - no taste at all, just speed),
Michael Angelo Batio (fastest guitarist in the world, but another one with no taste),
John Petrucci (Dreamtheater).....
and many more. Check each of those out and you'll see that Van Halen is no way the most skilled guitarist out there