Basically, I think we can't expect THAT MUCH from TV evangelists. They can be useful and they have their place
Do not... get caught up in this game of labeling ministers as either good or bad, we all fall short of the mark and you will always find things in ministers that you do not agree with completely unless those subjects really breach the terms of christianity then you take the meat and spit out the bones.
When you read literature, you accept that the writer has a different voice, set of morals, and came from different experiences. Try to give yourself a bit of similar distance, so that you are gaining what you choose to gain, but not giving yourself over to their entire body of teachings.
You are responsible before God, for seeking out the truth.
Most TV preachers started out with passionate ideals to spread the gospel. When they televised their sermons, they simply allowed a camera in their church services -- they did not go to Hollywood producers or bring in media publicists. Celebrity happened
after people started watching.
Most media preachers believe that God tells them to preach certain messages, and the range of styles/approaches/doctrines gets very diverse. Some will preach end times prophecy, some contemporary prophecy, some hope for provision, some asceticism and self-discipline, raising evangelists, raising intercessors, raising youth to lead, understanding Hebrew, exploring theology... the body is meant to have many different functions.
Listeners need to hear different things, depending on where they are in life. I believe that God gives these different types of messages, even though people think that conflicting messages means one person is wrong and the other is right. God as a "person" has many facets.
There are times I think Osteen sounds formulaic, and then a day will hit where I need encouragement, and he says what it takes to pull myself out. God uses everything. God used Balaam's donkey.
Stay in the Word, and continually decide for yourself. Don't ever stop screening what you take in. Doing that, you will have the freedom to take in many diverse things.