Since the 1988, but even if we just go from 2015, though - we lost two grand finals, which means we got to two grand finals. Not counting the Dolphins, there are seven teams in that span that did not get to even one grand final. We made the finals six of nine seasons, which is more than the Dogs, Tigers, and Titans combined. In that period, the Knights had three consecutive wooden spoons, and the Tigers two, compared to our lone spoon.
That's not suffering. You could barely argue we were mediocre. Solidly above average, if anything.