I went to last years game via montpellier and although the airport is cack, the car hire from the airport was simple and quick and the drive to canet was about an hour and very easy, only about 2 miles on A roads all the rest motorway/dual carriageway.
Car hire last year cost me 75euro for friday to monday with a brand new (done 200km) Megane, paid a 200euro refundable deposit to cover excess and 20 euro for full insurance with europcar which is the first hire car office as you come out of the terminal and closest to the exit.
The organised tours are great for people who aren't seasoned travellers but the cost is a bit steep, we went last year at a cost of £150 each for flight car hire and digs (for 3 nights) so just food and drink on top, so around half the price of the organised tour
Public transport down there is far superior to the UK so don't be scared to use it, not expensive and very reliable timetables on newish buses/trains, can't see why it's so poor in comparison in the UK
