Wearing contacts with bad prescription and astigmatism?

I am about a -6 in one eye and -4 in the other and have astigmatism in both. I just got contacts but I am not happy with them. They are not as clear as my glasses and go out of focus frequently. It is tough to read or use the computer with them. My doctor told me this is typical for someone with my prescription and astigmatism. Does this make sense or is my doctor just being lazy? I wore contacts a year ago and was very happy with them, and my eyesight hasn't changed that much.