While I never smoked many Marlboro Menthols, I can say that, for me, Dietsmokes' Parked's Nicquid Menthol fairly accurately captured the flavor of a Newport.
Taste, of course, is HIGHLY subjective. What I think tastes great might taste horrible to another person. What I think tastes like a Newport might taste like a peppermint to someone else.
Also, when you first start using your pv, your taste buds are already off due to smoking analogs, so it's hard to get an accurate gauge. Flavors that I liked when I first started vaping don't always taste great today.