I agree, Wolves were far better on the day and you'd expect them to have a reasonable season with some of the talent they have and they probably underperformed at times last season whereas Forest are destined for trouble. But it's still a home fixture against Wolverhampton Wanderers, you would still expect a Man United team to get a grip on things and ultimately there is absolutely no reason not to perform in such a fixture. Mount wasn't the only one by any means but nor did it help that our midfield was so open with him not having the game intelligence to drop in and help in any respect, not defensively and not in the build up phases. He wasn't responsible for the whole team structure but he was certainly an element within that as a key part of midfield.
Eriksen wasn't "great" but it was still a..6.5, maybe 7 type of performance. You say it's not games like today that will define who is suitable, but games like today are meat and potatoes. That's what we built around last season, solid home form. There are a fair number of teams that are only slightly better than Forest and at home we have to dominate. If we have players putting in stinkers like Mount did with no positional sense it doesn't help.
Let's see how Mount adjusts when he returns (this injury is very frustrating for building him into this team) - but at the moment I wouldn't put anything on him being the better option and it's not just based on a few games. It's based on his profile as a player and the fact Eriksen has real quality within the skills he does have.
I think Eriksen had a decent game on the ball and popped up with an important goal but was bad off it. I know it's been said a million times but since the injury he has lost that match sharpness and stamina (that wasn't even that great to begin with but serviceable) from the beginning of last season.
I understand 'you can only beat what's in front of you' and I don't want to downplay the result or performances but I feel like games like today are going to be 'rare' instances of poor quality opposition. Perhaps Luton will be similar. Otherwise, I feel teams like Fulham, West Ham, Everton, Burnley, Palace etc are the 'meat and potatoes'. If we continue like this and expect a Eriksen to work 'better' ahead of Mount against those teams, then it's very wishful thinking.
To clarify again, I'm not saying who is better, I just don't think today's game will be a good indicator against the teams I mentioned above. It's certainly not a reason to say 'Eriksen showed Mount how to play midfield' because quite frankly, Forest, 2 goals aside, were really poor. And by extension, it showed how bad we were. Anyways, regardless of those two players, the biggest 'issue' and responsibility falls with ETH imo.