Depends IMO I just think its funny how everyone rushes to go see sequels, and when they say they don't like it, they get others to see it.
1st one, it's rare that a second would be better. Like Scary movie, the 1st one was hilarious, but the 2nd and 3rd ones..Meh, they were funny, but got corny real quick.
I'm pretty sure that terminator wasn't supposed to be scary.... But I think that originals are far superior to the sequels.
It really depends on the film, but I say sequels are better based on all the series of movies I've seen: LotR - It just built up to a climatic finally with awesome effects and lots of action ~ PoC - The story and acting just keeps getting better and better ~ James Bond - The first ones just suck ass, casino royale was the HANDS DOWN best. Best actor, best script, and no gadgets (thank GOD) ~ Harry Potter - It becomes less like a kiddy movie and more like a teen film with each succesive title Those really are the only movies series I've seen