By now most people who are interested have watched the anniversary special and have their opinions about it. If you have not watched it than stop reading and go do something else since reading this could spoil it for you.
Go on then.
Here is one thing that is going to put me at odds with millions of people.
I did not like it very much. Yes, I know it has give the Doctor hope and given him a new purpose. Yes, there were humorous moments like Tennant and the rabbit.
Oh, it was great to see Tennant play the doctor again and seeing him interact with Matt Smith. Seeing Billie Piper again was good too. I just wish Rose Tyler had been in the special.
It was an ambitious episode that brought one of the big events in the Doctor's lives to light. It had great effects. But I found myself with more questions about it after watching it.
With 50 years of history I would have liked to seen more of the characters that made this show great. The episode only contained 1 companion, Clara. There was no Rose, Captain Jack, Mickey, Donna, Martha, etc. to assist the doctor. During the week leading up to the special Billie Piper and Catherine Tate did not do any of the commentaries. The end of David Tennant's run was more exciting for me than this was.
Here are some of the questions/problems I came away with.
1) William Hartnell (the 1st Doctor) said very plainly "You can't change history." Obviously they are going back on that. If history can be changed the Doctor can do it whenever he wants.
2) Paul McGann regenerated into John Hurt so only Eccleston, Tennant and Smith knew about the death of his people. How then did every Doctor suddenly appear around Galifrey to save it? Did the three go back and collect them all, taking time to explain what John Hurt had originally done? That would have taken time and, lets be honest, rather than this, why wouldn't McGann choose a different drink which would have created a different doctor? Simpler than circling Galifrey.
3) Are the Daleks really gone? Wouldn't they have stopped firing when they saw all the TARDISs circling Galifrey? Daleks are not stupid.
4) If the Tower of London was guarded against the Doctor getting in but he did anyhow than how can there be fixed points of time he cannot get to? He could save Amy and Rory. He is choosing not to. This also ties into number 1. History can be changed.
5) Taking away the death of his people is going to alter who the Doctor is. Since Eccleston there has been a darkness in the Doctor where he was torturing himself. It made him work harder to save as many people as he could (due to his guilt over his actions). That is gone now. It is like if Thomas and Martha Wayne had not been shot. Would Bruce Wayne become Batman if his parents had survived? No. That means the Doctor will be different.