"A slow movie that closely observes human beings and their relationships can be endlessly fascinating, while a thriller with nonstop wall-to-wall action can be boring, because it is all relentlessly pitched at the same tone." (Roger Ebert)
I've seen action packed films that I count as gaggers, yet I get so used to fast paced movies and television, that when I watch a slower paced flick, I feel impatient. But, if I relax and let the story unfold at its leisure, I usually find, like Ebert said, the movie to be endlessly fascinating.
And memorable.