Most metal bands that use orchestral or other backing work use these too. At that point, it's a matter of synchronising the live performers with that stuff you's spent a goood deal of money getting that choir or orchestra to record. Thankfully, with the best bands of this type, they tend to try and do as much as possible within the live performance.
To be honest, I think the sheer amount of badly-done artifical pap err pop music has really soured very many people to the concept of backing tapes, and any aid that keeps tempo. Queen used a fair amount of backing tape, and nobody ever said they were fake. Sometimes, you just need a degree of synchronisation, especially when your songs are more compositions than out and out songs (Nightwish, Dream Theatre, et al) which mean that there have to be moments where the band knows, to the instant, where to come in, or back in after a gap, without being able to hear exactly where they are on the tape itself.
As an aid to lousy drummers, I can see why they'd draw ire, but a lot of these drummers are very very good. They just need to keep a lot of things synched up to make their soundscapes work as they should.