I think it is sinful to say the New Mass, and especially the normal New Mass with altar girls, communion in the hand, extraordinary ministers, mostly women, banal and stupid ugly music and all the other abuses and signs of disrespect towards God which are normal in the Novus Ordo.
If the Mass were reverent and free of abuses, I still think it would be a sin, but not as great a sin as is usual with the Novus Ordo.
Anyway, I am only a simple layman, so you don't have to give my mere opinion much weight.