I had edited my previous post to point out that of course the wheelbase is not the only factor.
I think you can tell where these cars feel at home when driving them. The NSX (just taking a longer wheelbase mid-engined car for a moment) feels, all the way around, like it's designed for higher speed turns than either the 1st or 2nd gen MR2s (I haven't driven the 3rd). The MR2s both feel like they're designed for higher speed stuff than the Miata. If I had to rank them in order of where the car felt most "at home" I'd put them in that order. NSX, MR2, Miata in order of decreasing speed. How much of that is down to the wheelbase I'll set aside, although I note that the higher speed the sports car, the longer the wheelbase tends to be. The wheelbase of those three cars also happens to be in that order.
The Miata feels like a great car. The MR2 just feels more nimble, and more stable, simultaneously, and based on my limited experience I chalk that up to being mid-engined and having a longer wheelbase. I have driven the Mk2 MR2 with both a staggered and square tire setup, and it didn't feel like the tire setup changed the character nearly to the degree that hopping in a miata does.
I think that the turbo is not a great comparison with the miata, unless you stick a turbo on said miata.