While I remember his role as Snape, there's so many other characters I thought were even better:
He was practically the only thing I remember about that Robin Hood movie with that stuffed shirt everyone tried to call the new Marlon Brando. Who was that blond guy again?
Die Hard, most awesome villain.
The only reason I remember that The Hitchhiker's Guide to the Galaxy remake was because he was a most awesome Marvin.
Galaxy Quest, yes, it was a slab of cheddar, but the movie wouldn't have been nearly as enjoyable if it weren't for him.
So, yeah, I'm sad to hear we've lost such a talented actor, and this is from someone who generally hates movies.