There was a video posted on here a while back that demonstrated a very similar scenario

- wet, coming onto a wet roundabout, got a tiny bit of oversteer, way too much lock to correct and tank slapped the opposite way into the curb.

Simple truth is most people who drive an MR2 have never experienced oversteer and when a slide begins they apply anywhere from 180 degrees to full steering lock of counter steer, the car recovers and instantly turns the other direction faster

- snap oversteer.

It isn't the car's fault as many people blame! It's just inexperience and we have all had to learn.

In future try the following:

Learn the neutral throttle position

- the throttle position that will maintain speed or slightly slow the car, when you feel the back end move this is the throttle position you want to naturally adopt to get traction to the rear wheels quickly.

Jumping off the throttle is BAD! Going full throttle is WORSE!

Do not use any more than 45 degrees steering input from the straight ahead to initially correct, if the slide continued GRADUALLY apply more lock.

And most importantly, when the slide has been caught
bring the steering wheel back to the neutral position
.

A lot of people will leave a lot of opposite lock on even though the correction has been made, this leads to

"snap oversteer".

Finally, if you have gone to full lock to try to recover but are continuing to spin,
give up

- full brake and clutch in.

You aren't going to recover past full lock.

If you continue to try you will end up with the car turning further than the original path, locking up and braking will see you spin and have a better chance of staying on the tarmac.

Good luck!