It's that old chestnut again - kids and tv. Like everything else, I suspect it's probably best in moderation. We attempt that - we watch telly in our house - but not a lot. And when we do, it tends to be a sociable activity - M watches it with her Dad or me (and occasionally on her own if I'm in the middle of making tea and there's no-one else in).
But after a long day at nursery, or swimming, or buzzing about in the park, why shouldn't she sit down for 20 minutes in front of something she likes and relax for a bit? We don't tend to watch much scheduled telly (the 5pm slot is usually terrible), so it's usually something from a DVD like Shaun the Sheep, the Muppets, Bagpuss or the Clangers. We've always done this since she was small - and she's shown no signs yet of demanding more and more and more telly.
And on Saturday it's sparkly shoes for everyone and tea in front of the telly for Strictly Come Dancing. (M's betting on James and Zoe, while I have a sneaking love of the pixies Chris and Ola).