There will be a couple slow parts as the series progresses after season 1, but they're really building towards something YUUUUGE that happens later in that same season. I think there's only been one season thus far that people have complained about for having a slow pace, but a slow pace is hardly the same as nothing's happening. Despite all of its detractors saying that the show is all nudity an violence, there's a lot to consider if you really want to follow the story. Little things can have significant meaning.
This is coming from a guy who stopped reading the books at the end of #3, because the books just don't compare to the show, IMO.