That's because the MR2 is much more rear engined than mid.

When I dropped the engine out of mine, I couldn't believe how much of it was hanging out over the rear wheels, rather than ahead of it.

The Boxster is much more mid than rear, and I absolutely love them.

In fact, my brother and I are shopping for one this week as it goes. He really fancies an S, even though it'll be down on performance from his Z3M.