Rides are awesome, and like any amusement parks, in order to avoid lines it is suggested to come early in the afternoon.
I bought a season pass and the place was awesome for watching the international fireworks festival.
The restaurants are overpriced and the drinks are extremely expensive. However La Ronde does not check your bag and they allow you to bring your own drink (water, soda, no alcohol).
They closed some of the rides I used to enjoy few years ago, but they are constantly renovating and building new rides.