Here's how I understand the lie of the land to be right now.
If somebody signs for the club (Johnson for example), it's not because of Rafa, it's because of the club's history, the fans or the money. If on the other hand they decide not to sign for us and to sign for somebody else (like Gareth Barry for example) it's because of Rafa and the fact he didn't try hard enough to sign him last season.
If a player decides to stay with us for a while (ie Reina or Agger), it's because of club's history, the fans or the money. If on other hand they decide to leave (Like Owen or Alonso for example), it's because of Rafa.
If a player such as Gerrard considers leaving, it's because Rafa hasn't shown him enough love. It's not because our team and results were getting worse by the season. If and when though he changes his mind and decides to stay, that's because of the club's history, the fans, the money, his family, or the Scouse mafia. It's nothing to do with Rafa.
If we go into a Champions League final and are 3-0 down at half time and being completely outplayed, it's because Rafa doesn't understand tactics, didn't play 4-4-2, didn't start with his best 11 every match even though half of them were injured, enforced zonal marking and didn't send roses to the players the night before the match to show them the love. Not, of course, because we were playing one of the best teams in the world, with Crespo, Shevchenko, Kaka, Pirlo, Maldini and Nesta in the starting eleven. If though we go on to do the impossible and win the match it's because of our captain and not Rafa or the half-time substitution of Finnan for Didi Hamaan which nullified the threat of Kaka.
If we play again in the Champions League final, again against one of the best teams in the world, and loose then it's because of Rafa and his lack of tactical nouse. The fact that we got there twice in 3 seasons was because of our Captain, our fans and the money.
If we win the Champions League in Rafa's first season as manager it's nothing to do with Rafa. In fact it's all about Gerard Houllier, who was sacked the previous year after scraping into fourth, a credible 30 points off the winners Arsenal. If that same group of players wins the FA Cup the following season, ditto. If having rebuilt that squad at huge cost, we then win feck all for three seasons, it's because of Rafa...but when we have our best year in the league since we last won it in 1990, with our highest points total, beating United and Chelsea twice along the way playing some of the best football most of us can remember it's because of the Captain, the fans or the money.
If we win a big willy contest with Real Madrid it has nothing to do with Rafa, or his tactical ability, but when we suffer at the start of the season as our replacement for our playmaker which we sold is injured until October, it's because of Rafa. Similarly, if the pre-season run outs against Cricklewood Wanderers, Lando's ladies (?) and Merthyr Tydfill don't have us sharp enough for the start of the season, it's because of Rafa.
If we sign a striker for 20 million quid and he scores goals for fun, it's because he's a world class player who joined because of our history, our fans and the money. Not because of Rafa. If two seasons later we sign another striker for 20 million quid and he can't hit a cows erse with a banjo, it's because of Rafa - he's our manager and the buck stops with him (unless something good happens when it's probably because of our captain). Also, the fact that Rafa didn't want to spend £20 million for him but Rick Parry did the deal anyway doesn't matter. Rafa's the manager and it's his fault. The fact that we lost £8 million selling him back to Spurs is also Rafa's fault (even though we lost around £3 million).
It's all swings and roundabouts, everyone uses events to backup their own viewpoint then someone else uses the same thing to argue the exact opposite. In fact sometimes the same person uses the same event at different times to argue different things as their opinion changes! As Mick says the truth is probably somewhere in the middle. It's likely that what happens over the rest of Rafa's tenure will define how we eventually interpret the events of the last 5 years.