Totally honest answer? When she was a toddler she watch a lot, and while it hasn't doomed her, I don't think it's been good for her either. She is bright, lovely and has plenty of skills, but I recognise now that when she's watched too much her attention is all over the place, she's moody and can't settle to playing so easily. We've always read lots, she always has access to drawing materials and some great toys, and an adult is always available to chat or help with something. But still, there was too much telly.
With hindsight I was a bit depressed when she was a toddler (my parents divorced when she was born and soon after we relocated a hundred miles from 'home', it was a really tough few years) and stuck the telly on as a way to keep her happy while I sat on the sofa sulking...
Luckily for me, she is now 4 and moving away from it of her own accord. We have it on for half an hour in the morning and she may veg out a bit at the end of the day if she's tired, or we put a film on to watch together, but some days it's just that morning half hour and that's a big improvement.
I'd rather have her watch too much TV than have me shouting at her all the time. But I still wish I'd done better. :(