No one seemed to have a problem with Jaws being grindhoused, but Star Wars seems to be "sacred" to some (except to Lucas), so yeah, expect some [more] negativity. :p
I don't know why people get so up in arms over stuff like this anyway. Reminds me of some of those purists who appeared on Iron Chef, angry that the Iron Chefs were doing fusion cuisine and stuff. It's not like there aren't hundreds of chefs doing traditional Japanese cuisine anyway. Lighten up, fellas! ;)
In this case, there are tons of versions of the OOT available. And no one would ever mistake this 'grindhouse' version as an official Lucasfilm version, so who cares? It's just some dumb fun! A supplement to the "sacred" version, if you will. Haha.