"Utopia" has to be the best DOCTOR WHO episode of the new series, if for no other reason than it made me feel like I was twelve again, jaw dropped in awe of all the levels of awesome!
I'd always thought more of David Tennant's episodes were more good than bad, but there was something that didn't click the way Christopher Eccleston's run did. I think it has something to do with age. Not mine, but the actor's. To me, the image of the Doctor as this older, adult figure went hand-in-hand with his being a 900 year-old traveler in time and space. Whereas David Tennant is just over two years older than me. Not that his Doctor isn't all manner of awesome; it's just that some of the edge was taken off. Eccleston, on the other hand, has almost a decade on me. His Doctor, and his episodes, still held a bit of that larger-than-life gravitas for me. I enjoyed his run while fondly remembering the old childhood nostalgia.
But watching this last episode, I was right back there! Eleven or twelve years-old on a Saturday night with the lights out watching the only thing that PBS was good for (at the time, to me), getting my geek on.