Keeping the Deep around just because he was one of the last of the original 7 was garbage writing. He could've died last season or long ago. The new Noir death was shitty writing. The whole SB/MM storyline that was never tied up even though MM would lose his mind anytime SB was around and then.... not a word about him in the finale. Sage being the smartest human ever but not thinking of perfecting the virus from the corpses to kill Homelander or have an ace in the hole. She was so smart but the writers weren't clever enough to write for her intellect and it was a waste of a supe. Starlight was useless and has been useless the past two seasons. Hughie should have horrific cancer between the compound V and regularly being irritated. The Butcher/Homelander fight was a let down. Butcher has kidnapped and tortured people for less. And all Homelander gets is a crowbar to the head. That was anticlimactic as fuck. Also the number of people (adults and teens) Hughie has killed via his direct and indirect actions was just glossed over and he gets a happy ending with Mrs. Nasally herself.
The whole army of psychics plot point was wasted and under utilized, they could've hunted down bombsight once it was known he had the V1. Also Sage not thinking of checking to see if that old woman had a Vought pendant was a plot hole. It was so bad all around