To be completely fair regarding the perception of the Capel hire, most Pitt fans ope was based more on the perceived recruiting piece he was expected to bring to the table than on the X's and O's part of coaching. Also, anything decent after the Stallings debacle looked very good because----
(1) The Stallings hire was hated by the fan base from the day he was announced. He was immediately regarded as step down from Dixon.
(2) Stallings took what many (most?) Pitt fans believed was a halfway decent amount of talent left behind by Dixon that could/should be a foundation to be built upon. Instead (whether or not this was Stallings' fault has been, and can be, debated) everthing blew up (or was deliberately blown up) resulting in a PITT team that was constantly being blown out and couldn't even reach a ten win season.
Then, Capel added the three players (Johnson, McGowens and Toney) as late recruits and the team moved from Stallings' 8-24 (0-18 ACC) to Capel's 14-19 (3-15 ACC) and there was a glimmer of hope that things had begun to be turned around. Unfortunately, things have plateaued since then to bring us to where we are today.
Based on this history, it is no surprise that Capel looked like a slam-dunk hire compared to what had transpired before. Slam-dunk hire or not, he has proven to be far less bad at Pitt than Stallings.