Kids are currently 4, 7 and 10

Best Toys:

Trampoline
Swings
Scooters and Bikes
Lego and Lego Friends - love that they now make a girls range! Duplo when they were younger.
Little People (when the kids were younger they spent endless hours playing with them)
Thomas Train Table and wooden tracks - as someone else mentioned this table has housed so many things, it was always a great height. Currently has unicorns and Peppa Pig on it
Chess Set
Etch a sketch - still used. We have 2 and they have drawing competitions.
Pick up sticks
Snap cards
Light Sabres
For DS - figurines eg superheros and dinosaurs

Worst

Numerous Board Games - they don't seem to get the consistent use out of them, will play them once or twice and forget about them for a while
Trashies
Remote control cars
Various craft things. Again used once or twice and then end up with half empty boxes.
Baby Dolls and accessories
My Little Ponys
Tonka Trucks and Matchbox cars and tracks - Kids never really got into them