I think the question is kind of ambiguous, why I SHOULD like any band? Taste is a matter personal matter, just because I like power metal doesn't mean I should like all power metal bands. So here's a lists of bands many have regarded as good, great or sacred cows and I haven't/couldn't get into them:
Accept/U.D.O
Mercyful Fate/King Diamond
Nevermore
Slayer
Pagan's Mind
Vanden Plas
Tad Morose
Brainstorm
Stratovarius
Sonata Arctica
Rhapsody (Of Fire)
Agent Steel
Prototype
Artillery
The Sword
Evergrey
Sleep
Fates Warning
Symphony X
The Gathering
The Cult
Motley Crue
Queensryche
Manowar
Van Halen
Led Zeppelin
AC/DC
Pyramaze
Iced Earth (I like just two albums)
Symphorce
Sieges Even
Vision Divine
Virgin Steele
Dragonforce
New Eden
Kyuss
Orange Goblin
Twisted Sister
Dokken
KISS
Black Label Society
and all black/death/melodic death bands
quite a broad spectra isn't it?