'Brisk & businesslike' I think describes much of Boulez's approach to Wagner. The advantage of this is that you get pretty much what Wagner wrote in the score, without the sentimentality which some conductors impose on the music. The disadvantage is that you get no more than what is in the score.
Boulez's 'Parsifal' is typical of his style. I'd be willing to bet that it's the quickest recording available, coming in at about 3hours 40 minutes. Nevertheless, it rarely sounds as if Boulez is hurrying - he's just getting on with his job. The orchestral playing is excellent (Bayreuth), with perhaps only the Act 1 'temple bells' disappointing (it's always hard to make them sound effective - only Karajan really manages). Among the singers James King is especially impressive in the title role - a steady, clear voice. The recording catches the legendary 'mystical' Bayreuth acoustic very well indeed.
A good recording, one I'm glad to have heard, but rather lacking in 'heart'.