My two cents, since I went to both (yet) the openning gala and Sunday's Red Giselle.
Hated the Kassandra - totally hated, and didn't get it, even after reading the sinopsis before and after the performance (sorry, two more cents extra, we "joked" with my best friend, former ballerina, who also works for the company that is going through the $1B cost-cutting, why the choreographer made dancers wear $80 point-shoes, there's been no pirouttes, no demi-points, not to say a point position, just swift arm swings ;-(( they could have save money on the point-shoes).
..was imressed by the second half (but to my personal taste - too much of pair acrobatics - though it's Eifman's style... but his dancers bodies and their capabilities are stunning!!!)
we were lucky to be invited to the after-show performance, and saw the dancers (it looked that his dancers are all over 6ft, and so young....)
... i was hesitant about other performances, but liked Red Giselle (despite it's acrobatics ;-))
Added after seeing two Seagulls with two different casts:
Loved the duet of Nina Zmievets & Yuriy Smekalov (Arkadina & Trigorin - prima and classic choreographer). Liked the other two, Fisher & Abashova, UNTIL saw the second cast and TOTALLY loved Oleg Gabyshev (as a new choreographer Treplev) and Ms. Sitnikova as Nina (younger dancer).
Gabyshev & Sitnikova danced with such abandonment, with such passion, so convincing and so moving that I ended up loving the ballet. Sitnikova had great "vaganova" hands, artistry and some poetry about her, when she was swinging her hands about her lover's face it reminded me the way Obrazstova danced her Juliet with Fadeyev "kissing with the hands" (hope I will not be banned from the forum).
(to my taste) Sitnikova had classical training traits in her dancing, Gabyshev - extremely passionate, moving and convincing (much physically stronger than Fisher). Markov is prescine and precise, but doesn't have the same extensions as Smekalov, who was a total "seducer", when Markov looked like a "teacher".
I don't even want to compare Zmievets with Povorozniuk, may be it was not the latter's day. Zmievets, was a total PRIMA ballerina, had a full stage control, their acrobatic with Smekalov looked so efortless and light. The latter (to my taste) didn't have the stage presence at all, required for a Prima, doesn't have a proper turn-out, can't do a good arabesk, and almost failed a couple of lifts (so it was disappointing to see her after Zmievets).
Though may be Eifman was smart and split the perfect cast in half, so that each performance had two of the best 4.
PS: just found out that Seagull is a new ballet, it's been premiered in Jan '07.