For me there's a few things I dislike and wouldn't have in a layout.
1) walk through bathrooms. I don't want to walk through a boat bathroom that often, thanks very much (and I've got a nice one!)
2) kitchen one end, saloon the other. It's really hard to have mates over and cook at the same time. The living space is divided.
3) cross bed. I'm only 5 foot 10 1/2 and they're still way too short. plus they're a hassle.
I'm sure for every one of those points there's someone here who thinks the opposite
Oh, and
4) galley kitchen with units down both sides with corridor down the middle. They're cramped and corridor like and where they open into a saloon severely limit your options for laying it out.
Notice how I've not even mentioned my favourite stern shape or trad vs reverse yet !