No, Snakebyte, I don't measure the quality of a game by the fps.
But - when the computer easily meets the given requirements (which you can read here: http://www.shipsim.com/products/shipsimulatorextremes), then the game has to run in a way, that it can be played smoothly! Neither sluggish nor with constant crashes!
There is no need to look behind what you consider to be the horizon in order to understand that.
When this piece of software is the only 'heavy' software (as you call it), that doesn't run properly (slow, sluggish, faulty) on my PC, then there is something wrong with the software - not the PC.
And when additionally this 'heavy' software even isn't able to utilize even half the computer's resources, it simply isn't completed yet - probably because people kept shouting for the game in the summer 2010, when it wasn't ready.
But now nearly a year has gone by, and it's time for a solution.