Arnie really defined the 80's action hero with The Terminator, Raw Deal, and Commando being top of the bunch.
Also big names from that time for me are:
JCVD (Kickboxer and Blood Sport),
Bill Murray (Stripes, Caddyshack, Ghostbusters),
Chevy Chase (National Lampoons),
Steve Martin( The Jerk, Roxanne),
Eddie Murphy(Coming to America, Trading Places)
Jackie Chan anything before Rumble in the Bronx (terrible film).
Then you've got all the big films like Back to the Future, ET, Karate Kid, Ferris Bueller, Robocop, Full Metal Jacket, etc.
I always wacth them or record them if they come on TV, even though I have them on DVD, and some on VHS.
The 80's: crap hair, fashion, and music, but great, great films.