Not feeling anything after using elliptical....

I started using my elliptical trainer again - I've done it for 3 nights in a row for 40 minutes (hadn't used it in 5 weeks) and I don't feel even a little sore or anything in my legs!! Am I not getting a good workout??

I feel like I vary the intensity and resistance on it though. Am I doing something wrong?

You wouldn't really feel anything (as far as muscle soreness) unless you put the resistance up pretty high and also the incline high.
Like Jen said, the elliptical is more for cardiovascular exercise.