I don't know about the critics, but I've seen it last night, at a mini-marathon where we had Terminator 1 just before Genesys, and I liked it. I don't consider Terminator 1 as a masterpiece anyway, and some SFX did not age well (puppet arnold much ?). The retcon at the beginning of Genesys with T1 was really well done, the rest of the story is ok, nothing spectacular, but it feels like a terminator movie unlike the last one. It's a small 7/10 for me, as it seems to be for most of the regular movie goers on IMDB. Even the big twist John is a terminator is not that much of a twist, it's coming quite early in the movie and you can guess something is up by the time Kyle is sent to the past anyway.