Thanks for the fair replies. A fairer comparison indeed is the Byzantine Rite and the traditional Roman Rite (Tridentine). That said, with the Second Vatican Council and the Novus Ordo, Rome 'asked for it'. Traditionalist Catholics from the moderately well-informed on up agree with you! The Novus Ordo's a mistake, a stinkeroo, and because the Tridentine Mass is still relatively rare now, this video's a valid criticism, even if you don't buy the maker's and the blogger's premise.
That said, the current Pope's started to turn this around, not only lifting all restrictions on the old Mass but fixing the English in the Novus Ordo so even liberal parishes have to get the words right, so it's sound in spite of them (even though, with ceremonial like shown here, they make it annoying/unedifying; 40-year-old cultural BS it'll take a while to weed out).
The Catholic liturgical movement before the council wanted to teach ordinary Catholics to know and love the Tridentine Mass and the divine office (the Roman Rite's horologion). With that in mind, it loved and studied the Orthodox and other rites.
Justin, I wouldn't say trads believe God is essentially unknowable. They are orthodox Chalcedonians (blessed be Jesus Christ, true God and true man, as a prayer at one Roman Rite service says: the creed/Symbol summed up). A mystery of orthodoxy, both Catholic and Orthodox, is God's both transcendent and immanent.
The rule's always been to have the traditional Roman Rite in Latin but that's discipline, not doctrine. I think a vernacular option for the Tridentine Mass's a great idea. Would-be Catholics in the Anglican churches wrote beautiful translations many years ago (circa 1911 for example), Rome's for the asking (and the base for what some Western Rite Orthodox use, as a link in this thread shows). I also understand there's a rule allowing the readings (lesson/epistle and gospel) at the altar to be in the vernacular, but I understand trads in Europe do that but not in America.
Of course the Orthodox use liturgical languages too: Slavonic in Slavic countries; medieval Greek for the Greeks.