I cant imagine anyone else's voice for The Smiths, Moz's voice was perfect for their sound. Just my opinion of course.
Oh I agree absolutely. It's impossible to imagine The Smiths without his voice, those lyrics required that melancholic croon. It doesn't matter if he wasn't Roy Orbison, it was better that his voice was more flawed and unique. Michael Stipe also had this, being distinctive is the most important thing for a singer. Some have tried to replicate him with varying results - naturally I love Gene, but he is a one off original, just like as pointed out that you couldn't really detect the band's influences.