Personally, I never use the NIV. I’m not a KJV-onlyist or something (that whole position is illogical). There are a great many inaccuracies as opposed to other Bibles with the NIV. Not only that, but it is published by Zondervan, a division of HarperCollins Publishing, which also publishes the Satanic Bible and the a popular homosexual book with a pretty explicit title. I’m not kidding…
The NIV is intended “not to offend” people, so it uses euphemisms. I found only two sources with seemingly reliable information on the NIV, a Baptist source (PDF) and a mainstream Protestant source.
For example, here is a comparison of KJV vs NIV for Luke 9:56:
For the Son of man is not come to destroy men’s lives, but to save them. And they went to another village. (Luke 9:56, KJV)
Then he and his disciples went to another village. (Luke 9:56, NIV)
Now, I think that the righteous wrath of Christ, Who is God, is a pretty important part of the Bible, don’t you think? And I doubt that some scribe long ago just “forgot” about that part in his manuscript. YLT also includes it, and that’s one of the closest to the manuscripts.
I also used Bible Gateway to verify, so this has double attestation. The second source has even more examples of bad NIV writing.