I'm so glad I started watching Doctor Who from this season! Matt Smith, Karen Gillen and Arthur Darvill are SO delightful (I had no problem understanding Amy, even though English is not my first language, should anybody be worried about that) and Moffat makes engrossing, charming stories. I was spellbound all season.
If I had started with the first season I think the combination of the horrible effects and worse companion (Rose is the most unlikeable person in the world, not to mention her habit of lolling her tongue out of her mouth like a prize cow) would have made me give up after two episodes.
I really liked Tennant's doctor at the start, but RTD's forcing him to that weepy, clingy ending completely soured his performance.