I have nothing against the metronome. I certainly could stand to use more time practing with one. And recording with a click track has been a established practice for a long time (though I'm not convinced one way or another whether it always (or never) results in a better-sounding song).
But since when has it been acceptable practice to have a drummer play to a click track during a live show? It's one thing if the band is using some kind of drum loop, an often-but-not-always dubious proposition (Radiohead has done it well). But just having a metronome keeping the time underneath seems wrong somehow. Not to mention that I've seen bands play where you could hear the thing ticking off between songs.
I assume advances in technology have allowed bands of all levels to utilize a computer to help keep the time. For all I know, this practice could have been around among big acts since the 80s. Still, it only seems like recently that I see drummers wearing headphones as they play. Might just be my musical snobbery emerging, but it seems a little weak.
And of course, I couldn't let this post end without a link to the song Metronome by some band called The Bosch.
OK, if you're going to call bands out for bringing the click track, name some names!
no need to jump to conclusions, though.. we use in-ear headphones sometimes but it's for monitoring vocals, as it can be difficult to hear yourself clearly on stage..