I've been to Macau races twice (last time was a couple of years ago). Both times it struck me as a little bit forlorn. The facilities are kind of shabby and when I was there at least, other punters were few and far between. If you are a big horse racing fan then I'd probably go, but just keep your expectations low.

I paid general admission both times so can't comment on the availability or otherwise of any MJC packages.