In terms of dramatic representation, there's not really much you can do with Tristan und Isolde, which conversely means that an imaginative director can do just about anything with it. Bayreuth doesn't really seem interested in staging traditional productions of Wagner's operas, but in an opera like Tristan und Isolde, that shouldn't matter in the slightest. It's not a historical opera tied to a specific period, it's a mythological opera about the mysterious forces of love. Christoph Marthaler's 2005 production for the Bayreuth Festival, recorded here in a 2009 performance, finds a good balance between making the drama and the interaction between the characters intriguing to consider, while still being faithful to the opera's themes.
From the costumes and the décor of the ships interior in Act 1, it looks like it is randomly set in the 1930s, but not over-realistically so - the sets there to create a specific environment that ends up working quite well, rising into three tiers for each of the three acts, maintaining a fluidity and consistency in the piece. The main visual theme however - considering its significance in the second act - is that of lights, from the neon ring "stars" in the sky in Act 1, to the light switches of Act 2, and the pulsing rings of Act 3 that could represent love or life, or the two combined in death. Obviously, this is highly conceptual in a manner that those who like a more concrete, literal stagy representation dislike, but it suits the nature of the opera, and certainly suits the nature of Wagner's conceptual themes, without distracting from them or imposing a false reading. The performers fit well into the stage directions laid out for them - looking a little incongruous and a little uncomfortable at times with the eccentric mannerisms, but mostly finding a perfect accommodation between the words, the emotions and dramatic interaction with each other.
Iréne Theorin is fairly magnetic throughout as Isolde, capturing her haughtiness and conflicted feelings for Tristan in Act 1 with a degree of precision, and finding a similar level of emotion in the contradictory impulses of the Liebestod in Act 3. Through much of Act 2 she appears to be in a love-potion-induced trance, acting without volition, almost in a state of madness, which may not be how one would expect Isolde to be played, but her childish, playful eagerness to switch off the lights does capture a perfect sense of complete abandon to her condition to the disregard of any rational sensibility. Her singing is strong, only occasionally faltering, but a fine representation of her character nonetheless. It may take a while to warm to Robert Dean Smith as Tristan, but any doubts should be dispelled by his handling of the incredibly demanding final act soliloquy that he delivers magnificently with such impassioned yearning that you almost fear that he, like Tristan, is going to push himself over the edge. Michelle Breedt is a fine Brangäne, her singing strong, her acting in character throughout, and Jukka Rasilanen as Kurwenal delivers a touching performance, particularly in his sympathy for and fidelity to his master in the final act. If there are any minor irritations with interpretation and staging in the first two acts, all should be redeemed by Act 3, and that is certainly delivered here under the baton of Peter Schneider.
The Opus Arte Blu-ray looks good for the most part in terms of the 16:9 video transfer. There are some problems with the quality of the audio, but they are mainly down to the recording, positioning of the actors and the acoustics of the live performance on the Bayreuth stage. The minimal staging, the positioning of the performers and the surrounding walls give a somewhat echoing quality to the singing in places. In Act II's "Isolde! Geliebte! Tristan! Geliebter!" for example, with Theorin and Dean Smith backed up against the walls, the singing fails to rise above the orchestration. The orchestra isn't ideally clear either and doesn't make a great deal of use of the surrounds, tending to be mainly focussed towards a centre stage. Extras include an optional conductor camera visible in a small box at the bottom of the screen (a pointless feature when Bayreuth productions otherwise do their utmost to keep the orchestra and conductor invisible in line with to the composer's intentions), as well as an illustrated synopsis and a 25 minute making of that looks behind the scenes at the staging of the production at Bayreuth.