Destroying our attacking balance by removing our most creative attacking player, Nani, with an aged Giggs is not down to teething problems. Its just a tactical error. Similarly to how removing Kagawa for Januzaj against West Brom was an unneeded change. In both cases, unforced, Moyes destroyed our coherence as an attacking force. Although, despite losing the West Brom sub was more forgivable because after about 20-25 minutes Januzaj finally got his tail up whereas Giggs went from bad to worse.
Also I do think this post Fergie stuff is being overplayed a bit. Johan Cruyff's shadow still hangs over Barcelona, words from him can disrupt a club presidency. He built La Masia, he made Barcelona's philosophy what it is. Yet Barcelona still managed to do ok when he left. Bobby Robson, Van Gaal (at least at first), they took the reins at the club and still were competitive, still won things, they didn't just suddenly drop off because their legendary player and manager who'd reshaped the way everyone at Barcelona now looks at football was gone. Not saying Moyes has got an easy gig but, I should think, many managers would kill to have the job he has now, the squad he has now and we should stop dismissing the mistakes he makes as just part of the post-Fergie transition.