I agree 100%. *Any* production of Sweeney Todd walks on a razor's edge. I've seen it a few times "live" now, and it's always been bad. The material is always fighting to get out in spite of the performances; the show needs impeccable performers in the lead roles and VERY firm directorial hand, or it fails, utterly. I honestly believe the role of Sweeney is the "Hamlet" of musical theatre: everybody wants to try; few have the chops. The same can be said, in a way, of many of the other leads - especially Mrs Lovett.
I fear for the potential film version that Sam Mendes is looking at; I think the material will have to be adapted, rather than translated, in order to work.
Did anyone hear see Bryn Terfel when he performed the role in Chicago in 2002? I heard good things... and apparently he's doing it again with the Los Angeles Opera in 2005?
"There are only two tragedies in life: one is not getting what one wants, and the other is getting it." -Oscar Wilde