I keep reading about the poor MBA work visa situation in the UK and USA.

Can somebody please advise me, on what other English-speaking places have good work visa opportunities for non residents and decent career prospects?

Canada and Singapore; Australia. Maybe Malta?

Canada tends to be a good choice, since I think you can get a two or three-year work visa upon completion of a master's program, if I remember correctly. Plus the industries in Canada are very diverse, a lot of options from energy to finance and tech.

Along those same lines, Australia's also good but I believe that you need to do a two-year MBA in order to get a work visa versus one-year programs which do not fit the requirements.