It's quite simple. If you were a huge Aggie fan in the late-1970s, early 1980s, the arrival of KM changed everything at Kyle. John Mazur was Jackie's "coup", a USC transfer. Well, he sucked (not alone), and Jackie went 5-6, 5-5-1, and 6-5 his first three years. After a dying wishbone attack (Emory becomes a memory) and a high-school level HC (Tom Wilson, literally), people were pretty fed up. Even Bum Bright questioned Jackie.
Against that backdrop, Murray took his 35K Brewers' bonus and came to Aggieland.
You can pick the rest up in the history books. Like our record for the next ten years. KM was the catalyst.
Others prefer to dwell on his "personality". If he ain't getting arrested, I don't care. The team followed him, period. Then, there are those who think the Kyler-era changes anything about documented history. Everyone is entitled to their opinion. Mine: JFF came along, causing KM to fall to the 2nd best Aggie QB ever. And, yep, he seems to be a jerk.