I don't see how anybody that put a lot of time and money into following the club during the Megson era could pick Coyle.
Yes it was ultimately Coyle that took us down, but it was clear that Megson would eventually get us relegated. Not necessarily the season he got sacked, but we were getting worse and worse, despite that he always had money to spend (twice as much as Coyle). It's not just that he was over-defensive, anybody that says his tactics, selections and substitutions weren't generally questionable has a short memory.
I came away from most games we won under Megson thinking, "how the hell did we win that?"
It's wrong to blame his failings entirely on his personality. He wasn't a good tactician, he didn't spend money well, his motivational skills were appalling - the team was an absolute shambles under his management and fortunate to be considered worthy of a PL place.