Ihave had the opportunity to make Marquette wine a couple times so far and will hopefully get to make some more this year.
The hype over this variety is staggering, but it appears to give one of the better choices for a vinifera like wine from a hybrid. I believe it is overarated myself. Whenever anyone tries it, they all say it is a good drinkable wine, but short of anything special. To get that bit of something extra, I think it will need to be blended with another grape. The brix gets great,especially where you are, but the acids remain somewhat high but workable. The cherries here in the north aren't as profound as they could be and the tannins are a bit soft.
You could grow Corot Noir and Noiret there (Cornell grape breeding program). They both make a better wine than Marquette in my opinion, but aren't quite as cold hardy. If they would survive better here, I would probably grow them over Marquette. Noiret has nice tannin levels, plenty of black cherry especaially on the front end, black pepper and other good qualities. The Corot Noir is similar with a bit more tannins.
I am in kind of a unique positi0on to test many of these varieties as I am the caretaker for a 25 variety cold hardy trial in Willsboro NY, as part of the Cornell Baker Farm. I have had the chance to work with varieties not yet common. I also have about 30 varieties planted in my own vineyard. Go to the Home Vineyards section here on the forum and check out the My Champlain Valley Vineyard thread. You can go from ground breaking and planting through finished wines entered in the Winemaker Magazine Competition.