Ok good answer, COG is a good factor to point out. This is part of the cause of the body roll the MS3 has (it's not terrible, but it is more than I would like - hence the Hotchkis sway bars on my car!)
I was stuck thinking that you were talking about structural rigidity. Which I believe the MS3 is very good at that aspect.
The MS3 is on the heavy side which is the only complaint I have. But it is fairly big for a "small" car. It's hard to find a new car that weighs even as little as the MS3 that is also as practical and as capable. But that weight is really only a problem on very tight tracks, or autox. The power to weight is decent, and in my experience the MS3 handles very very well on the track. The combination of handling, braking and power make the MS3 very good on the track for a 20k car.
I find a car can be transformed in it's handling qualities simply by changing the tires.
The way a car responds at the limit is also very important to me, and that is where the MS3 will make you look like a hero. Many cars that are as fast as the MS3 on the track (S2000 for example) will bite back and bite hard if you get a little bit ham-fisted with it. The MS3 just keeps on tracking. That's what's allows me to put down quick lap times over and over again. I push the limit lap after lap. I can pass people all day long in cars that handle way better than the MS3 could dream of, but those cars are hard to drive, the drivers are afraid of destroying their car.
pardon my off-topic rambling

Just wanted to share what makes the MS3 good in my experience.
I'd like to hear from an MSP driver that has a good amount of track experience. That's what really matters to me. Slalom times, skidpad, has almost as much to do with the tires as it does the car. They look good in a magazine next to the acceleration times. How the chassis behaves at the limit on the track is what sets a car apart. I'd think the MSP has very good potential at the track, with a tune, tire upgrade, maybe suspension upgrade it should be quick!