I'd never describe the MX-5 as a cruiser. I owned a MK1 model and it was loud at a cruise, with relatively short gearing and lots of wind and tyre noise, it felt far more at home being thrown down a twisty road. Couldn't agree more about the "smile on your face" bit though, I've driven cars with twice as much power that were half as much fun.
They do need to make it lighter though. I had a go in a MK3 and it definately felt a lot heavier, the driving position was significantly higher as well, and the steering was too assisted. I just felt a lot less connected with the road.