In fact the "bad" thing about sub sims compared to most other games is that they are slow paced sims and require a lot of time in the campaign mode. The good thing is that because there is lot of non action time, you don't have to stare at the screen all the time and you can do something else while it's running - of course we have many accounts this has lead to some bad events like if you're too far away when planes show up or forget you just hit the D key before going in the kitchen to prepare a coffee or grab a beer in the fridge...
