Firstly, Eccleston was awesome! I agree, my favorite Dr. My kids love Tennant and Smith for different reasons.
As to our new Dr. I agree with what is stated above, the first episode is always difficult as you have to 'transition' to the new Dr. I felt the writers were too obvious with trying to make us accept the new Dr. through the way the plot was done (avoiding spoilers). I mean seriously, the character who had issues with it really shouldn't. I wasn't let down, but I wasn't impressed. I hope the villains play an important role in this season, as it felt like it was an odd opponent to bring back and again, only to make us accept the new Dr.
Here's to tomorrow's episode!