Not a big Whovian, but my gf is so I catch a lot of it.
Liked it, but very flawed. Like my gf said, is this had been Star Trek, it would have been a three-parter by now. It felt that rushed. To much storyline for a 60 minute special. Throwing together basicly all the Doctor's enemies at him at once, and all you really see is a few Daleks shooting, a few Cybermen shooting, some explosions... If you want to do something like that in a story, either go ALL OUT, or come up with something else.
As for linking a lot of older plots back to this (the destruction of the TARDIS, River Song), again, if you want to do that, do it proper with more story to it, instead of a throw away line here and there.
As for Tasha Lem.... New character and all, but are there really no female characters from ALL those years of Doctor Who that could have served a similair purpose? That's an honoust question really, because we are supposed to really think of her as a big thing since she's known the Doctor for years and a previous regeneration. But how are we supposed to care if she's really just a new entitiy?
Having said all that, I did enjoy myself with the good humor and entertainment valua of it all. But as for grading...all I know is that I enjoyed the Day Of The Doctor a lot more then I did this special.