This acclamation is not theologically wrong, as far as it goes. Christ did die [for us], Christ is risen [now and forever], and Christ will come again [in glory with the fullness of salvation].
However, the greatest deficiency is its very form. It is a statement about Christ, not a prayer or acclamation to Christ. The Mystery of Faith (currently called the Memorial Acclamation) in the original Latin, as well in all its other translated forms, current and new, are addressed to Christ, as in, “Dying you destroyed our death…” or “We proclaim your death, O Lord…”
When we made the Acclamation a pure statement of faith, a Memorial, it encourages us to treat our faith as purely intellectual, an assent of the mind to the truths of Christ and God, salvation, and so on. We already have strong tendencies to do this. It is particularly sad that this form is by far the most commonly used; I suspect 90+% of our faithful use this form 90+% of the time. It became the standard of our faith on this point. (Remember the saying Lex orandi, lex credendi, loosely translatable as “the law of prayer is the law of belief”? This is one illustration of the saying.)
But when we make the Mystery of Faith a prayer, addressed to Jesus Christ himself, the greatest Mystery of our Faith, it engages us with the person of Christ, who has just become more deeply present in the Eucharistic species. I particularly like the new form C: “Save us, Savior of the world, for by your Cross and Resurrection, you have set us free.” with its added outcry “Save us…”! We are (I hope) so fully caught up in the moment, in our need and in Christ’s presence, that we cannot remain passive and objective, but must call out to Christ who has drawn so near us.