Can't believe what I'm hearing. Rooney coming on was exactly the right decision, and the sort of substitution which (whisper it) I often found myself wishing Fergie would do more in his last couple of seasons. Rather than trying to close out a 2-0 lead with a defensive substitution (or none at all), he built on our dominance by adding a fresh attacking threat. It's psychologically crushing to the opposition to see a brilliant forward come on when they're already struggling to cope with us.
Rooney coming on took what little wind was left out of Norwich's sails, and as a result we've come out with a 4-0 victory and some long-awaited momentum rather than a 2-1 or 3-1 and more questions.
The fact that, in Rossa's words, 'he hardly broke a sweat' strikes me as a positive, not a negative. We've won convincingly without Rooney really having to put too much work in, keeping him fresh for the long season ahead. Strikes me as a perfect substitution.