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.
