I think the whole premise of the show is just not what people expect. There's only so many acts you can have (i.e. after the first couple of series) before it gets 'samey'. But that's to do with the whole concept/definition of "talent". There are thousands of different things people can do to be classed as talented, but it's not all suitable for the Royal Variety or a TV programme in general.
Someone playing the drums really well can be classed as talented, but you can't get to the final of a 'variety' TV competition just doing that. There's no solo drum acts around making names for themselves. And that's what I mean by it all becoming 'samey'. There's only so many things that can be seen as 'talent' with regards to a TV competition which will have enough variety to win and then still be different enough at the Royal Variety. That's why you see the same acts over and over again. It's not because the TV show itself has passed its prime, it's just that people don't have a good understanding of what it's there for.
You can't take the 'talent' word in the title so seriously. At the end of the day, it's an entertainment programme. That's why there's not much 'talent' on it. It's there to amuse and sell advertising. The same as any other TV show.
Regarding the criticism of the new format/judges, I didn't think it was any less entertaining. In fact I enjoyed it more. I love Michael McIntyre, and David Hasselhoff is just a fruit cake. Simon Cowell is a bit bland (he just says the same things over and over again) and Piers Morgan is (or at least comes across as being) too arrogant to judge people in this format. I think the new judges interacted very well with each other and the contestants, and I thought they made it a lot funnier because of this.
Lighten up, people - the premise of the programme isn't to find talent, it's to provide entertainment.