I've not seen OBT in this, though I saw the MCB Balanchine Nut earlier this month. I join Helene in hoping that our Oregonians (and visitors) will give us their impressions from Portland.
Here's the relevant quote containing the ambiguous "museum piece" reference:
QUOTE
One could argue that Balanchine's version is a museum piece, fascinating for its history and trotted out year after year for its formidable ability to raise company revenue. But that would ignore the very real pull this ballet exerts on children. As the young balletomane seated next to me at Saturday's matinee breathlessly asked, "Is that real snow, Mommy?" The adult eye sees creaky sets, hopelessly dated costumes and intricate choreography. The child sees magic.
The review itself explains (indirectly) the real power of Balanchine's version for adult: the amazing, inventive, complex dancing. I'm not refering only to the variations and the big ensembles, or to the central pas de deux. The party scene -- with parents and children -- is full of character dance and intricately choreographed moves. It's almost TOO packed with detail and incident.

The variations are wonderful (though I agree with the reviewer that there's something odd about Coffee's Turkish harem look).
Most of the review focuses on OBT's dancers. That's the part that contradicts the negative implications "museum piece." Great choreography challenges dancers. (It helps when they are Balanchine trained, but I don't imagine it's necessary in this ballet.) Clearly the reviewer found that the OBT dancers met the challenge.
Nutcrackers can be danced in several ways. I've seen Balanchine's version performed without conviction, without the sense of newness and wonder that it requires. I've also seen it performed with electricity and excitement that seem to energize everyone on stage. It sounds from this review as though OBT's performances this year are in the second category.