This is dumb idea and requires that you open your email to login to a site that you want to use. Faster is just typing your username and password and pressing the login button. Anyway browsers make this even faster by storing the username and password.
I do not necessarily disagree with you that I'd prefer a username/password, but please be nicer than "this is a dumb idea" - someone spent quite a bit of time making this work.
Sorry, but I do not see anything bad at saying "this is dumb idea" different would have been if I had said "This is fucking stupid idea". Anyway my negative points kinda were earned. :(