I must say this rhetoric has always made me feel a bit uncomfortable. The implication being that because we've been promoted a couple of times and play nice football, fans are no longer entitled to disagree or question ANYTHING the manager does.
He's primarily accountable to the fans, you lose them, your position soon become untenable. I am obviously not advocating that, my point is, he's made some stinking signings so far; Hussey, Leonard, Thomas, Washington - It's not an indication of being a negative fan to question a random signing.