They've been around for over 20 years and changed...I think thats pretty natural. The energy they had in their youth has gone and they can't play thrash anymore.
A couple of bands that changed within their lifetimes:
*The Beatles - from the all smiling pop band to experimental.
*Radiohead - Brit-pop to prog rock
*The Rolling Stones - youths to zombies
(how Keith Richards is still with us is beyond my understanding)
Anyway, I think you get the idea.
Its a shame that they've sold out and going "Wessside." Mind you, their bassist left because he's going deaf...how rock'n'roll