No it isn't. One of the most important traits a car can have for highway driving in the US is quick acceleration for safe onramping and lane changes. I drove a friend's Leaf for about a week back in January, and I can comfortably say it performed worse in this regard than my previous car, a 2004 Honda Civic, which only had 117 hp.

My experience has been very positive with the Leaf. Acceleration is more than adequate by my standards, and I generally have 65-70% remaining after my 28 mile commute. I wouldn't want it to be my only car, but it does its job well, and for a very low price.

The Leaf has modest acceleration, but 0-60 in 10 seconds is far from dangerous. Your Civic will do that sprint in just over 9 seconds with a manual; it's typical to add a second or two to the times of automatic cars of that era.

Not sure which model you drove, but with eco mode off, the Leaf's acceleration is nothing short of impressive.