These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Nanatsu No Taizai
Crazy Awesome: While not nearly as much as the mangaka's previous Kongoh Bancho as of yet. The world is filled with warriors capable of causing the ground to shatter beneath them, even a Mook can easily cut down an entire forest with ease. Ban and Melidolas for example destroy the tower they're in an arm wrestling match.
Fridge Brilliance: Gowther said King didn't want to use his full power in battle, probably because Helbram. King spent his complete fight with Helbram in his human form, that according to King himself takes a lot of concentration and energy. King was, in fact, handicapping himself and not using his full power!
Fridge Logic: If Diane feels so ashamed by her height, why does she wear high heels boots?
Golgius stabbing a man he forced to poison Meliodas to save his daughter. Luckily the man survived.
Helbram attaking the village and putting civilians in danger. His justification? "We need to make the Sins the villains for us being the heroes". Prior to that he said that his dead subordinates (who were giving him power) weren't a big deal because We Have Reserves. No wonder why Geera put a Heel-Face Turn at the end of the chapter