That's why ... I stopped watching it and I wished that they cancel the show altogether and that's how I see it going. This show is very much parallel -- Adam West's Batman Show ... The first two seasons were good and then the 3rd is so bad -- about one third into the 3rd season -- I've stopped watching it.

After 3rd season of Batman -- it was cancelled. I can see it's happening with Supergirl ... 

5/21: Well that episode was different. Outside of the Guardian story very little happened. I do like the story with John & his father as they deal with his father's dementia. The possible outing of Jimmy Olsen as the Guardian was very timely & handled well. Props to Mehcad Brooks who got to show his acting skills in a different way this episode.

6/4: IMO one of the worst episodes. I will watch the last 2 episodes but unless I read great reviews next season I won't be watching this series anymore. It became a chore to watch it. Then there would be a decent episode & it gave me false hope because then the next week it would be back to the same story. This 23 episode season could have been decent if the story was told in 13 episodes. But like I said in another thread I think the CW shows have this problem... a great idea that would be good for 13 episodes that they pad to a full 23 episode season.

And this show suffers from being too "preachy" with all the subtleness of a brick thrown thru a window to get their point across. I disagree that the gun issue was balanced. I found myself rolling my eyes at the end result.

Supergirl has always been preaching from soapboxes since its first season, and its showrunners cannot stop themselves from beating audiences over the head with their high school debate team-level of messaging. In the latest episode, Winn's non-violent option for guns turned out not be so effective after all, as it ultimately got a man killed. The Kryptionian witches were kept at bay by Kryptonite bullets--both the concept of guns and Kryptonite possession coming under fire from the showrunners, yet it made perfect sense that one of the objects of showrunner revulsion were the only thing preventing the complete end of the DEO staff.

I guess that's the writers acknowledging the knee-jerk "get rid of lethal weapons" directive did not make much sense....but I am expecting Winn to come up with some convenient, "This time, it works!" non-lethal weapon. Could be courtesy of Brainiac, who appears in the season finale.

The series still has not explained how a world wide threat / appearance of Kryptonians / discovery of Argos City has not been brought to the attention of Superman...you know, the other Kryptonian on earth. With one episode left this season, they cannot keep shoving Superman into a corner, especially with a plot he should be 100% interested in investigating.

They've overdone everything: 'Angry, angsty, Kara'; 'Cold, detached, determined Lena'; 'Brooding J'onn'; 'About to cry Alex'; 'Bromance Winn and James'; and '"Still Reign, but I'm gonna save my daughter" Sam'.

Having said that, I get that they want to show Supergirl take on some threat that's 'supposed to be a job for Superman'; it is her show, after all, and that was never something that was handled well in her Silver and Bronze Age comic series(other than taking on 'legitimate threat' Lex Luthor, and 'C'mon, even 'Mazing Man could beat THAT guy!' Master Jailer, towards the end of the Superman Family run, she didn't really fight too many of her cousin's villains in her own feature, without his help).
On the other other hand,being so drawn-out and typically 'CW''-esque, it is feeling a bit like when DC'conveniently' wrote Superman, Wonder Woman, and Flash out of the 'Martian invasion' storyline in the old Justice League, just to prove a point, as all three of them did nothing of note in their own books.