The r may not always be as dramatic of a roll as your ear is expecting. This depends on the place in the sentence and the sounds that come before and after it. It will, however, always be different than the normal English r. You have to train your ear to hear (and pronounce) the subtle Spanish r sound (as opposed to the more dramatic one you usually hear when rr appears in the middle of the word, or r appears at the beginning of the word).
Also, as has been said, there is variation between accents and from speaker to speaker.
I hope I've made sense and answered your question.