The 'steps' on flat-ish decks can be made less obvious by printing the hulls at 45 or 90 degrees (the former works quite well but leaves a touch of roughness on wales along the entire length, but minimises discrete 'stepping'), the latter gives a very clean appearance, but you need to cut off the bow or stern (or split mid-ships somewhere convenient) and print it separately for a clean result. Ideally you don't want significant detail "down" on supported surfaces, or large *almost* flat areas on the top. Flat is fine, and a reasonable angle is okay, but where the difference between layers is on the order of the scale of your details it ruins the effect.

Less of an issue for larger models, where the detail is big compared to layers, more of an issue with smaller models.