Thank you for voicing the concern!
I personally think Extraordinary Form is a legitimate phrase to use to denote the TLM, for various reasons:
Second, just linguistically, "Extraordinary" can signify "out of the usual" or "not normative", but it can also signify "Better than ordinary", such as "This work is of extraordinary quality." Whether or not Benedict XVI meant the term in this latter sense, it demonstrates that there is no inherent equality in using the phrase Extraordinary Form. We could even argue that it implies an inequality.
Third, neither Traditional Latin Mass nor Tridentine Mass are any more accurate. "Tridentine Mass" seems to attach the Mass too much to the Council of Trent, when in fact we know it goes back to Gregory the Great. When we say "Tridentine Mass", we unintentionally injure our own arguments because we make the Mass a thousand years younger than it is. "Traditional Latin Mass" seems to suggest that the most distinguishing fact about the traditional Mass is that it was in Latin. If Latin is the fundamental point of contention, then there is no real objection against a Novus Ordo in Latin.
Now I know those who use the terms TLM and Tridentine Mass do not mean to imply these things, and I would not dream of suggesting you do. Similarly, when I use the phrase Extraordinary Form, I do not mean to deny or minimize any of the very real issues with the Ordinary Form, nor do I think did Benedict XVI when he coined the phrase while simultaneously maintaining that the NO was a "banal, on the spot production."
Finally, we could argue that because the Roman Pontiff has himself chosen this terminology after much reflection, this is the most appropriate way to refer to it. This terminology preserves the unity of the Roman Rite while acknowledging the very real distinctions between its two expressions.
And I think Extraordinary Form is preferable to Vetus Ordo. Just my opinion. I'm not going to insist on saying EF. Sometimes I still say TLM or Tridentine Mass. But it's good food for thought.