Honestly dude, on what grounds are you classifying them as unquestionably in the Top 5? You like them, fine, but it's blasphemous to put them anywhere near bands that actually belong in the top 5. Yes. Blasphemous. Some of these are debatable, but here is a list I came up with, and every one I think deserves more recognition as a talented rock group than U2.
Zeppelin, AC/DC, Rolling Stones, Allman Brothers, Lynyrd Skynyrd, Jimi Hendrix Experience, Beatles, Pink Floyd, Tool, The Who, Dispatch, Red Hot Chili Peppers, The Clash, Sublime, Counting Crows, CCR, The Eagles, Derek and the Dominos,Steve Miller Band, Hootie and the Blowfish, Nirvana, Mars Volta, Neil Young, Bob Dylan, Pearl Jam, Rage Against the Machine, Phish, Umphrey's McGee.