The mid-eighties was a great time to be a prog newbie, with the prog itself undergoing some rapid changes and the Monthly allowing you to dig into some great content from the recent past. I think that gave me a different perspective on things. While I found Harrison's SD art jarring, it made sense next to Bisley's ABC Warriors and Slaine, or Hicklenton's Nemesis. Reading both the prog and the monthly meant that these artists defined the strip for me just as much as Carlos, O'Neil, Talbot or McMahon (I think McMahon's Slaine was actually the most jarringly different art for me at the time).
Without the gut rejection of Harrison's art, and helpfully minus the knowledge that Johnny was to be offed, I loved Final Solution, and thought that it stood up really well on reread when the trade came out. In particular, I never got the hatred for Feral. Again, I think this is because I took him as another new SD character, rather than an Alpha replacement.
For me, the problems came post-Final Solution, when the nature of the strip was totally turned on its head, and Feral was this new central character, without anything interesting actually happening. It always seemed to me that Grant was setting things up for a post-Final Solution situation where SD could work as an ensemble piece, with Feral as one of many central characters (maybe integrating characters from the Tales of the Doghouse strips). Shame we never got that.