In concept, and indeed in many of the episodes, it is an good show. However, the writers seem to be seriously struggling to come up with good ideas.
They seem to be recycling old and tired plot-arcs, one-upping themselves each time and including an annoying amount of sappy filler.
How many times has "the whole universe(s)"/"all of space of time" been saved from the Daleks/someone else of that ilk now? Each time pulling the solution more or less out of a hat without any real substance to it.
I'm also not a fan of the newer Doctors rather clichéd, over the top and repetitive style. You'd think someone who's ~900 years old would be a bit less hopelessly hyperactive.
We need more Eccleston, Planet of the Ood, and Weeping Angels, and less cheesiness, sappy writing, and using the "I'm the Doctor" or other equally vapid sound-bites as a valid line of reasoning.