No, but I think the common Christian tends to gloss over their sins as 'not as important', like gossiping and lying (even those are in the top ten). The bible does say that if you want to be forgiven, you have to forgive (which would imply that God has something to forgive us for), but that doesn't mean that your sin is equal to the rapists - for one thing the rapist is guilty of at least three sins I can think of (a sin against another, a sin against God, and a sin against himself), whereas the victim who can't forgive is only harming herself (it's not like the rapist cares if she forgives him).
Furthermore, if there can be a great commandment, then it makes sense there can be great sins and little sins. Even before the time of Jesus there were degrees of sin, and you were required to sacrifice something equal to the size of your sin; there is nothing in the Bible to suggest that has changed. The main difference is that Jesus was the ultimate sacrifice and we don't have to worry about the size of the sin anymore.
If you ask me the greatest sins are the ones that go against the greatest commandments - to love the Lord, your God, with all your heart, mind, and soul and to love your neighbor as yourself. In other words if you sin against God (like blasphemy or idol worship) or you sin against your fellow man (like in rape, incest, pedophilia, lying, gossiping, murder, abuse) those are the big sins.
But that's just my opinion.