I didn't think I was going to like this episode from the trailer last week, but I really enjoyed it after all. Jenny wasn't as annoying as I thought she'd be and I liked how Donna was a bit of a mum to her.
I couldn't work out why the leader didn't know the truth though. Surely he was older than 7 days (he looked around 50 to me) unless the machine just randomly made him older than the others or they age really quickly.
Edited to add that I think Martha is a bit of a meany for leaving the Doctor after he thinks his daughter has just died!