Taking over a 1-7 team and finishing 5-11 and then going three straight seasons at 8-8 is not impressive. What you fail to mention is the team he took over had the same players who went 13-3 the year before. So the team obviously had talent. The 1-7 season was just a train wreck and there was a lot of blame to go around, but he didn't do much better when he took over. This isn't the old days. Coaches can take over 2-14 teams and go 12-4 the next year (see KC Chiefs and Indy Colts).
There are things I do like about Garrett, but there are also things I don't like. But overall, what matters is results, and he hasn't shown results. I like how we haven't been afraid to cut ties with old players since Garrett got here. I also like our attention to improving the O-line. I like some of our draft picks (trading back for Frederick, Tyron, Martin, Lawrence) and I also don't like some of our draft picks (trading up for Claiborne, Escobar in the 2nd, drafting injured players). I don't like how he manages the clock and I don't like how he abandons the run when it works. I'm indifferent toward the RKG philosophy because I don't really understand what he's trying to do. He passes on guys who are character concerns but then gets guys like Melton coming off a bar fight and tries to keep Brent coming off manslaughter. Sometimes it seems like he's running the team, and sometimes it seems like Jerry's running the team. All in all, there is a lot I like and also a lot I don't like, and I think he needs to really put up or shut up this year.