Do not condemn an ordained minister of God. My sister has always warned us never to condemn the ministers of God (no matter how sinful or backslidden we think they are). That deceiver, that cruel one, that this and that that...
She always said we should pray for them, instead. I really learnt this from her. I try as much as possible not to abuse or condemn them.
One thing I have not bothered to ask her is 'the verses that support this'.
So, what is wrong calling a spade a spade? And what are the verses?
Well, really we shouldn't condemn anyone christian or not. However I would imagine its highly important for Christians to keep an eye on those in charge to see if what they're saying coincides with scripture.
[Romans 8:1, Acts 17:11-12]
You are right that ministers should be called out, we do have a duty to expose liars and hypocrites, coming from an oft-touted scripture whose second half is usually ignored [2 Corinthians 11:14-15]
But of course we are all sinners, and live in 2012 not 0040. So we have to view every person on their own terms. We live in a time of apostasy as much caused by ministers than it is by culture, if it isn't KJVOs (pharisees) its heaven and hell teachers (saducees) or those who teach that its okay for a Christian to take class A drugs and go to orgies cos they're carnal Christians (antinomianism). [2 Timothy 4:3-5, 1Tim 4:1,]
So..
I think that on the basis of supporting godliness, we should follow Paul's teachings [2 Corinthians 13:1, 1 Corinthians 5]
We should also remember Jesus letters from Revelation, they're a pretty good representation of what God wants from his churches, as are the beatitudes. Also remember that condemnation isn't telling someone that they are a false teacher, condemnation is telling someone that they are going to die, or suffer eternal punishment. Pointing out something true, is likely to show them the error of their ways and save their lives, here and after the resurrection [John 8:32]