I have often wondered about the audition process, I just think you will get singers that can actually sing ballads really well. The only slight different 2 singers that have appeared on the show are Rhydian, who funny enough has gone on to be pretty successful and Jamie "Afro" Archer, who was classed as nothing more than a pub singer by Louis, whilst bigging up Jedward as major talents FFS.
The thing is, how would someone like Florence and The Machine get on if they auditioned, (I personally think she sounds like a cat who has just had it's tail trod on whilst someone scrapes their nails on a blackboard at the same time) but she has been quite successful, so why would she be overlooked by the X Factor judges, when someone (probably Helen Keller) has heard something to give her a record deal.
I think a lot of acts in today's chart would be completely turned down at the first audition stage, but they have made it somehow.
I guess we will always have the popstar with a decent singing voice and the right look that will win, or even get through.