Well, she is the main character.

If they just invented the lead weakness for the show I would agree with you. But this goes back to the silver (?) age in the comics. It's unfortunate, but it's totally based on comic book origins, not a reference to anything going on in Flint or elsewhere in the States.

"Lena cannot be "good" because she does what Winn does" Lens is a business woman that own a global company. Winn is the head computer specialist at the DEO. Two of these things are not like that other.

"So Kara killed Rhea, and probably some other Daxamites that didn't make it back to their ship in time."

"So Zod's Superman's greatest fear/enemy? Sucks to be you Lex Luthor" This reminded me of the Lego Batman scene where Batman told the Joker that Superman was his greatest enemy. Also, Zod is always trying to kill/enslave Earth. Lex is trying to just kill Superman.

Would you rather had Kara eagerly fighting her cousin?

Other than that Mrs. Lincoln, how did you like the play?

Comic book SCIENCE!

Cat had already figured it out in season 1 before J'onn showed up in disguise as Supergirl. I'm assuming that sometime after that she heard about J'onn (and other shapeshifters) and figured out that she could have been tricked. She probably figured it out 100% when she returned in these last 2 episodes and…

Kara loved Mon-El because he overcame his past and became a better person, a hero. At the end of this season you still look at Mon-El as just "a former slave owner", then maybe you weren't paying attention to the season and this isn't the show for you.

And Superman attempting to date-rape Lana Lang.

The decision to use the lead bomb wasn't Supergirl's. It was made by the DEO and the government to use it (she made the final decision when she realized that Rhea wouldn't abide by the trial-by-combat rules/consequences).

It was established in the comics that Mon-El/Daxamites was allergic to lead, so if they came up with some other element/thing for them to be affected by, people would say "No, it's supposed to be lead!"

At one point in the comics, didn't they explain the disappearance of Clark's clothes by saying that there was a pocket in the inside of his cape, and that's where he put his clothes when he changed?

Didn't the comics at one time establish that Superman (and also Supergirl) projects a millimeter-thin forcefield around his body protecting his outfit? Before this wasn't the story that his outfit was made from his Kryptonian baby blankets and that's why they were invulnerable, but they later changed it to that…

Mon-El was the main character's romantic interest this season. If you're not interested in him, or in the effect their relationship has on Kara, then yeah you're probably not going to like this season.

My take on it: Rhea does not have Kryptonite when she first arrives. After her husband dies and she goes undercover on Earth, when she's not wining and dining Lena, she is doing research on Supergirl, who she knows she will have to battle in the future. Kryptonite seems to be widely known - doesn't Leena tell Kara…

Some people are ok with the idea of an alien coming to Earth and getting superpowers from the sun, but the comic book science of a lead bomb - THAT'S too unbelievable.

"I won't kill you … but I don't have to save you."

Red Tornado was an android, so I don't think she killed it.