I must partly agree with Becks, but if you're asking this question as a survey, then I think the more answers you get, the better.
Children are affected by all influences around them (family, TV, friends etc.). Their personalities are shaped by their experiences at this age - much more so than later in life. With so much time spent watching television, it is impossible that children could be left unaffected by it.
When I was younger I remember watching things like Postman Pat and Thomas the Tank Engine, as well as lots of Disney videos. I don't doubt that these had an impact on my personality, and I'm sure I would be a very different person today if I had been made to watch today's programmes (e.g. SpongeBob SquarePants, Little Bill, Pok�mon).
Perhaps I am being pessimistic, but children's programmes today seem to be getting ruder and more disgusting than they were 5 or 10 years ago. Do people like that kind of thing more nowadays, or is it just a cheap method of churning out cartoons? I'm sure there is much to be learned by observing the television shows a child watches, and then seeing how they turn out.
Most significantly, children tend to copy what they see on TV, as well as get a sense of what is acceptable behaviour, and how they should be acting. If children see their favourite characters being rude and hurting each other, or putting on makeup and lipstick, or just being disturbingly crude, they might be tempted to copy. On the other hand there are some brilliant children's shows. I've watched Arthur and The Big Bang and I think that kind of thing is pefectly suitable viewing for kids, as well as Blue Peter (althought this might have gone downhill a bit) and many others.