I think the overall IS package is excellent, remember that for a sub 20 k car you are getting straight 6, rear wheel drive, traction, multi CD, leather, electric roof, climate, heated seats . . . the list goes on. Good residuals to boot.
Also great reliability and build quality and that road presence with the flared arches and bonnet bump.
The big downers for me are fuel ecomomy and really poor service from Lex dealers.
Also it's the little things that let the IS down -
1. The spare is fitted upside down so you can't check the pressure without taking the whole wheel out
2. The boot hinges intrude into the storage space so you have to leave those 2 areas clear when loading
3. The mirrors fold in at different rates
4. Petrol guage is from a Starlet