His show is really inconsistent, and only the really good places actually see any real change. There's a shithole diner in my college town he went to that basically is on the brink of closure every time I stop by but only stays open because the owner has enough funds to burn and thinks having Guy there will make everything "eventually pay for itself" despite it being well over 7 years with no changes. A few other places he's been to in Atlanta were close to where I used to live, and 2 of the 4 have since closed. Only one of them (Vortex) managed to stay relevant and that is only because it was already a niche goth hang out.
As for Guy himself, I don't know anything inside or outside of my chef circles who genuinely like him or think he's a good chef. I mean the dude doesn't even like eggs. He's really good at making simple home cooking look interesting and creative with a few simple twists, which is good in some ways I guess, but all the restaurants he has personally opened are Universal City Walk / Down Town Disney tier.