Movies So Bad They're Unmissable

According to Rotten Tomatoes, these are 25 movies that are so bad they are unmissable:

SHOWGIRLS (1995)
BATTLEFIELD EARTH (2000)
GLEN OR GLENDA (1953)
PLAN 9 FROM OUTER SPACE (1959)
ROBOT MONSTER (1953)
HOWLING II: YOUR SISTER IS A WEREWOLF (1985)
THE BLACK GESTAPO (1975)
FRANKENSTEIN ISLAND (1981)
ROAD HOUSE (1989)
MANIAC (1934)
THE GIANT CLAW (1957)
THE TERROR OF TINY TOWN (1938)
SATAN'S SADISTS (1969)
DEATH BED: THE BED THAT EATS (1977)
BEN & ARTHUR (2003)
SHARK ATTACK 3: MEGALODON (2002)
THE ROLLER BLADE SEVEN (1991)
ISHTAR (1987)
TROLL 2 (1992)
MANOS: THE HANDS OF FATE (1966)
FOR Y'UR HEIGHT ONLY (1981)
BATMAN & ROBIN (1997)
MOMMIE DEAREST (1981)
THE OSCAR (1966)
THE GIANT SPIDER INVASION (1975)

I've seen the ones in bold print. 4 out of 25? This is one list I won't use to further my film experience, but given that, I wouldn't mind seeing Glen or Glenda, Road House, and Manos.