They should have made 5th higher or added a 6th gear. In my opinion, a higher 5th would be fine. 1st-3rd handle all the legal speeds for the "fun factor". They probably have it this way because people don't know how to downshift and want passing power in 5th. If you want passing power in top gear, get a big V8 (my '04 GTO would do just under 2k RPM in 6th at 75MPH, but still had plenty of power on tap). An Insight without assist teaches you about downshifting real quick.
It should be quite a rocket with gearing that low and that much power/weight.