Sure, Dick Van Dyke's accent is hilariously atrocious, but his performance is so energetic and lovable that the flaws just slide off my brain. Also Mary Poppins is still a great timeless film that I think it should have won Best Picture over My Fair Lady.
The accent may be horrible, but Mr. Van Dyke gives a wonderful performance.
I can't even imagine how horrific Michael Crawford would be. He would give the same hammy, screeching performance he gives in "Forum" and "Dolly". He makes the two movies unwatchable for me.