He was the best there is, the best there was and the best there ever will be!
Anyho...
As a complete driver I'd rate Jacques just below Mika and TGF (tied for the top spot IMO), but above Damon and then the rest, well at least in his first 3 seasons, after that it sort of went downhill with some improvements in 2000-2001 as you might have noticed...
In those first 2 seasons with Williams he was definitely on par with TGF in terms of speed and skill, but sometimes dropping the ball made it a tight squeeze for the title fight, losing out in his first season and narrowingly winning it in the second one, in arguably the best car, although the Ferrari was seemingly on par with the Williams at least in the second part of the 1997 season...
To make it short, he was good, very good.