Ultraman? Well I've watched a lil' bit of Tiga and some of Mebius. The only series that I've watched completely were Nexus and Ultra Seven X. As for movies, there's Ultraman: The Next, Mega Monster Battle: Ultra Galaxy Legends (the first appearance of Ultraman Zero), and Superior Ultraman 8 Brothers.
Actually, the first Ultraman series that I've watched was Ultraman: Toward the Future/Ultraman Great back in '92. You could watch all 13 episodes on Hulu.