I've just seen it, I mostly really liked it. I loved the surprises: the going into the depths of the bath, the topsy turvy song, the underground leery song, the cantankerous park keeper "keep orf the grass!".
I think Mary Poppins herself was fine once I'd got used to the plummy voice. She had some good lines. "Some people think far too much... of that I am certain."
When the original Jane Banks appears, the clue is that she says "many thanks sincerely", as she does at the end of the advertisement song in the original.
I thought the Banks family were dull. The children, although they try very hard, I couldn't feel their emotions like I remember doing in the original: their wide-eyed wonder when MP arrives, their larking around in the Uncle Albert scene, their genuine terror during the bank scene, and of course their tears when MP leaves. As for Michael and Jane... they were boring to watch, unlike the original Mr and Mrs Banks, who had a lot of comedy.
For those who saw the stage play of Mary Poppins, do you remember the really terrifying "temper temper" song (where the nursery toys grow to enormous sizes and punish the children for their mistreatment of them)? I thought nothing in this film came close to being as scary as that, not even the abduction, or the "edge of the bowl" moment.