Best
KISS: 1978 Destroyer Tour, 1996 Reunion Tour, 1990 Hot In the Shade Tour. Pretty much every show I've seen and I think I've made at least 50. Taken my wife, my kids, my dad all at least once.
Charlie Daniels Band: Probably 1981 or 1982
AC/DC: 1998. Right under the cannons during For Those About to Rock *FIRE*. I was deaf for several days and hearing hasn't been right since.
Earth Wind & Fire: 1978. Funkalicious.
Journey: 1981
Prince: pre-1999 release. First time I heard some of those songs.
Also: Hall & Oates (saw them six or seven times), Olivia Newton-John Physical Tour (she was so sexy), Duran Duran, Van Halen 1984 tour. Enjoyed Bayfest in Mobile last year: Nelly, Lady A, Crue, EWF, Skillet, Fuel, Godsmack, Saving Abel, Shinedown, Tonic, Papa Roach and a bunch of country acts I'd never go see.
Worst
Hank Williams Jr. and Jerry Lee Lewis. Drunk, forgetting the words, farting in the microphone putzes.
Travis Tritt and Marty Stuart
Chicago (drunk, forgot the words)
Guns & Roses (huge disappointment, Axl was a jackass and screwed up most songs)
Eagles, Hell Freezes Over. They opened with Hotel California so my favorite was gone early. All they did was sit there and play the songs. I can spin a CD and hear that. Nothing blew up, nobody spit fire. It was just guys sitting around in jeans.