Those people in that vid are seriously over the top.
Yes--and they are not alone in the extreme hate aimed at the Brooks version of the Olsen character.
I just don't like the constant referencing back to Superman every time he gives Kara advice. On reflection the show to a point is in Superman's shadow. And i think thats where the dislike mainly stems from.
One, James has years of experience--his own and that shared with Superman, so its only natural that he talks to an unsure Kryptonian by referencing another--her cousin. If she cannot break out of the shadow of all fans know about Superman, then that is a failing of the writers--which stems from the source (Supergirl) never having much of her own legendary legacy to build on.
This obviously is the fault of writers not brave enough to make Supergirl her own standout character.
Agreed.
Two, the Superman issue is not the reason for the hatred of James--it all centered on James being the "wrong" version of James and an even larger "wrong" as Kara's love interest. If James had not romantic plots with Kara, this very vocal, ill-minded part of the SG fanbase would not say a word.
Not wild about the characterisation of Jimmy Olsen either, though not because of how it departs from some other version of Olsen, having never been invested in *any* incarnation of the character, but because he's been written as utterly bland. One note. Only there to create drama, without any real agency. Doesn't help that there's not much in the way of real chemistry between him and the star of the show.
James is not a flighty character from Glee. He's an adult--and so is Kara. He's also Superman's best friend, so when he moved to her city, he already knew who Kara was, but no matter the mutual attraction, he was not going to act on anything until he was sure of his feelings. The season has suffered some bumps in the development of the James/Kara relationship (centered on the unnecessary Lucy subplot), but overall, it had to move at a more realistic pace, than the usual "will they/won't they--jumping each others' bones" quick pairing seen on too many series over the decades.
Personally I'm hoping the show gets retooled for season 2. There's some things that work very well, some things not so much and others they'd be better off just dropping altogether. The worst part of it is that the major components of the show just don't fit together very well.
The Berlanti team's sloppy or weak writing is the biggest culprit, with Supergirl often making bad decisions, or some of the supporting characters placed in situations that breaks credibility. Now that the 1st season is over, as you say, some retooling is needed, and that should start with SG not acting like she's stumbling through life.