It's not so much belittling their achievements, they all did fantastically well. Forest have previously lost 5-0 to a more youthful and inexperienced Gooners side in the League Cup only a season or two ago so to beat that Arsenal lineup no matter how uninterested they looked was impressive (unfortunately)
For me Cambridge is the result of the round for me just ahead of Kidderminster, glad they held on.
I'm not talking just the Arsenal side selected or any individual games this weekend. I'm talking in recent times by a wide variety of PL clubs, there is absolutely no doubt that domestic cups have been sacrificed as shown by team selections in favour of the league for years now. Whether it be a top side chasing the title, top 4 or European place. Or a lower PL side concentrating on survival, the finances of both the PL and European competitions has devalued both the league and FA cups. The evidence is plentiful and tbh I don't blame them.
As I said earlier it doesn't change the feelings for those giant killing teams and supporters. The romance of the cup is still there and it's still magical it's just the PL teams and many championship don't care anywhere near as much. I'd also suggest the fans of these clubs feel similar as a result with disappointing attendances.
Hopefully we can one of those giant killers soon as it's long overdue. Loved that away trip to the Stadium of Light and that cup shock.