Can give further thought as i go through the series..
Series 4 - Utterly Brilliant is pretty much all i can say. Pretty much every episode is top notch and Turn Left is the best episode ever. Bring back Tate and paradoxes and common thread through the series with a climatic end.
Series 5 - I warmed to Smith very quickly and there were some great episodes such as the Byzanteum two part. The Weeping Angels should be around more often.
Series 6 - The poorest series by far. There were some very good episodes like the doctors wife, The curse of the black spot and the river episodes in the middle. On the whole though i thought that Rory was a bit along for the ride and there were a number of poor episodes. I was quite a fan of Dorian.
The opening sequence to series 5 absolutely rules, that should be the Vortex!