The plot of demons and angels is still vague to me but it serves up enough of a storyline to provide for some entertaining fights.
Meliodas and his demon past was being peeled back so slowly throughout the series that it felt old. I know it's a huge core component of the plot, but it gets referenced so much they're reminding the viewer about it every chance they get.
Elizabeth's transformation as a character, as little as it is, felt kind of sudden. All of a sudden she's more bold and displaying some sort eye power. I'm assuming that gets explored more in the following season.
As flashy as the combat was, it always felt one sided. They're always saying what someone's power level is like this is dragon ball and crushing their opponent or being supported by outside help to turn the tide. I can't remember any truly fought for victories that didn't just end in a crazy powerful final blow. With that kind of power, they were just buying time and could've ended it a long time ago. This may be stereotypical in anime, but maybe the long-haired muscle knights didn't execute it as well.
