We have travelled on Cunard and Thomsons cruises in the past, so we have a bit of an idea about different standards.
Marco is a small vessel, holding around 800 passengers, our outside cabin was small and nothing special, clean however, but just like an overnight ferry to Holland or somewhere, not luxury at all. It was noisy and vibrated a lot, possibly as the ship is so small?
The entertainment wasn't bad to be honest.
The atmosphere is very casual, a little too casual to be honest, and only 2 formal nights, where a tuxedo wasn't required.
The food was fairly awful to be honest, one night, an Indian theme, was fine, all the other food was poor, the coffee was dreadful, and the breakfast was sub standard.
We met some nice people though, as we were shoved on a table for 8, after requesting a table for 2! we also requested an early sitting, and a double bed, we got neither.
Overall, not a luxury cruise by a long shot, just like a channel ferry, we will go to the fjords again, but not on this ship!