Unfortunately the government doesn't seem to follow the eighth amendment, which forbids things such as torture, so why even have an amendment forbidding it. It's just a waste of time and space to go over it and consider it a law. If it were actually being followed as it's supposed to be then no, it should not be repealed.
While there are reasons to waive the Eighth Amendment in the case of someone like a terrorist suspect being captured, it is an awful idea to get rid of it across the board. Doing so would result in a drift to the far right regarding criminal justice, and would take away many of the rights that the accused presently have.
No, the 8th Amendment should not be repealed, because it is a good thing that we do not have cruel and unusual punishments. I do not necessarily agree with how narrowly the Supreme Court has construed our right to be free from cruel and unusual punishments. However, not having physical punishments is a good thing.
I believe there are parts of the Eight Amendment that the government itself has decided not to follow. This does not mean the amendment should be repealed, it means it needs to be upheld. Our government corruption should be addressed with such things as the Eight Amendment. We shouldn't just shrug our shoulders and decide to get rid of it.