Game is fairly good, it does get a bit long winded tho, there is no campaign, strictly sandbox build up empire game.
Its highly mod able I haven't tried modding it myself, but the community has lots of different mods going that overhaul it and change lots of stuff.
The ship designer is really cool, when I say ship designer tho, I mean the internal workings of the ship i.e. engines, weapons, shields or armor, power source etc etc, the actual ship "skins" you don't design in game, however there are people who make ships models that can be imported, if you want some variety.
The one thing that I do dislike a little is the newtonian physics on ship movements, the way it works is your ship accelerates towards a destination, then slowly decelerates, like how our space shuttles work - one big engine burn to speed up then to slow down, now when you order ships to attack they quite often overshoot where they are supposed to be going, thus you have to like order them to a point about half way in between where they are and where you want them to go, just to micromanage the travel of ships.
This game has a lot to it, and can easily get confusing, so is not for the faint hearted, however if you like the challenge its well worth it. There is an in game chat window that you can use as well to chat to other people around the world playing it, even if your playing single player skirmishes.
Games can typically last at least 6 hours
If you want something more arcade like, I would recommend sins of a solar empire instead