I guess cats are like marmite then.....
I got adopted by a cat, had her neutered only to receive a call from the vets to say she had already been 'done', so she went through it all twice lol!
She hunts regularly, mainly mice, but has also had a young stoat, squirrells, young rabbits and rats. All this is essential for me where I live as i am certain I would be overrun with mice etc if she was not around. This 'service' is well appreciated by farmers especially, and between cats and jack russells everything should be kept in check.
With regards to the birds, I feed the birds and ensure the tables all have good visibility all around and they are high to prevent the cat from performing ninja style leaps in pursuit of feline kentucky. This all seems to work, but I must admit the oranges sound good.
In my humble opinion, grey squirrells are more of a threat to our birds than cats, they eat the eggs and also nick all the bird food people put out.