I think the best thing to say about Moments is that they are mislabeled and should be noted as Extreme Moments or something to that effect.
The AI is the Versus lineup most of the time and not HUT cards. This should be noted as well since you're playing a team with all their abilities active and don't appear to lose endurance. To add to the difficulty you're forced to use sub-80 HUT cards with a possible MSP tossed in that only have the Endurance for 1 rush up the ice.
The top HUT Creator has said that EA confirms that all AI Goalies in all offline modes are on All-Star regardless if playing on Rookie, Semi-Pro, Pro or even Superstar. This could be a big reason you hear many players say Superstar is a tad easier than even Pro.