Some very brief history for those that dont know:
1996, Outstanding rookie year, most wins for rookie year (record held with Hamilton) almost won first race after putting the car on pole and took the championship with his experienced team mate Hill, down to the wire.
1997 Won the Championship.. we all know that. 7 wins, a 3rd, one 4th and 2x 5th's.
1998, Renault had left Williams and the new car was a dissapointment, he got a couple of podiums and finished 5th in the Championship behind the 2 Ferrari's and the 2 McLarens. His team mate Frentzen came 7th.
1999, first year in the new BAR team. The car was a DOG. He DNF'd the first 11 races! Finished 21st in the Championship. Neither Jacques or his team mate Zonta scored any points.
2000, the car was a little better and slightly more reliable, Jacques came 7th in the standings, behind the 2 Ferrari's, 2 McLarens, Fisi in the Benetton and Ralf Schumacher in the BMW. Team mate Zonta came 14th in championship.
2001, similiar to 2000, best of the rest 7th, got a couple of podiums. Team mate Panis came 14th in the championship. Dave Richards became new team manager (disliked Jacques)
Was voted "drivers" driver in either 2000 or 2001...
2002, car wasnt very good, JV came 12th, Panis 14th in championship.
2003, the car was unreliable, JV
DNF'd 9 times and sat out the last race as Dave Richards wanted Sato in the seat. Finished 16th in the championship. Team mate Button finished 9th. Was clear that Dave Richards wanted Jacques out and favoured Button, Jacques was effectively dropped at the end of the season without time to find a ride for 2004.
2004, raced last 3 races for Renault, which was a mistake, he wasnt used to the Renault car and took him a while to get to grips with it, much like the Fisichella situation at Ferrari this year.
2005, took a while to get to grips with the new Sauber car, but after that was nip and tuck with Massa all year, finished 2 points apart in the championship. Massa in 13th place, Jacques in 14th.
2006, BMW took over Sauber, although JV had a contract they wanted to get rid of him but realised it would be expensive to pay him off so kept him onboard. Nip and tuck with Heidfeld before being dropped after a crash, for the last 6 races in favour of Kubica...
He was beaten by Button in 2003 imo because he was tired and sick of the crap at BAR. Dave Richards was pushing him out and he had just run out of energy and motivation.
2005 and 2006 he was a match for both Massa and Heidfeld.
Every other year he beat his team mate.
Jacques problem was that apart from 1996 and 1997 all the others cars he's driven have been mid- field at best or at worst complete DOGS!
Heres what JV thought about grooved tires back in 1998:
http://www.youtube.com/watch?v=XT0Sp4SNBlYQUOTE (potmotr @ Jan 10 2010, 18:09)

I think seven and a half seasons on grooves would be more than enough to adapt.