As Howard says, preparation of the surface before priming/painting is all important. Try to get as perfect a finish as possible before priming and use several coats of primer,gently flatted down between coats. However, to answer your question, you will find that matt paint shows imperfections more than other finishes.
After 20 years of modelling I still can't decide what finish best represents full size ships. Most ships look pretty matt at close range, largely due to a coating of salt, but at some lighting angles can seem very glossy and reflective. I generally use Halfords' acrylic sprays as I find them very easy to work with and very hard wearing. I then cover them with a light coat of satin varnish. I suppose if you were modelling the RY Britannia or a millionaire's gin palace then full-on gloss would be apt.