This is not MR2 specific but you can measure the distance from the left and right strut top and compare it to a collision free car, it would indicate suspension/frame damage if it's different. Look for wierd tire tread wear, if it can't be aligned it means theres still some suspension damage. If the hood/lights/bumper align perfectly it's usually a good job.
If a repair has been done by a professional shop it should look "like new" and might be worth it.
Take it to a body shop and have them check it out. They'll be able to measure more reference points -and probably more accurately- than you can by climbing under the car. If they're a reputable shop that doesn't think they'll get any other business from you (i.e., they're not looking for more work), you should get an honest opinion. That alone would be worth the cost as a bad job may mean you buy a car that has all sorts of expensive problems down the road.
I don't think I can get the car to a shop when I look at it, but I've been given instructions on to see if the frame is too out of whack. If I can detect any problems I'm gonna walk from this car. That sucks though, still trying to find a decent 2 for less than 7k