Ryder is not a terrible character, he/she just not belongs here:

I prefer stockings

what does Hale's overrated voice acting have to do with Ryder?

I think FemShep is more laid back.  MaleShep comes off as a robot with a stick up his ass sometime. 

I like Ryder just fine. Ryder is an explorer. Shepard is an N7. Revan is an amnesiac Sith Lord. Their goals are all different and they're all different types of characters. I'm actually a big fan of Ryder and I loved Shepard like nobody's business. I don't expect them to look or act the same, or else we can just use Shepard instead.

Well this is Ryder's rise as a pathfinder. So of course he comes across as green. And I found nothing wrong with the dialogue.

Agree with most of that video.  The constant joking and general lack of appreciation of the task they were undertaking does diminish the narrative BW is trying to sell.  There is a big difference between being a newbie and a greenhorn and just not taking anything seriously.

It worked up through habitat 7 because they really didn't know how big a shit show they had all just walked into and Alec was there to keep things focused.  After that though it should have been a pretty big slap in the face to everyone that 'hey this is some serious crap we just got dumped into".  That's not to say there shouldn't have been any light moments but they needed a proper time and place for that.  It often just feels like a constant barrage of how "look how laid back and cool we are".

They really needed someone like Alec to keep things level.  Drack would have served as a great balance here for the less experienced crew members, getting annoyed at all the kids and making sure they understand this is really a fight for survival they are in.  Unfortunately he just kinda joins in with all the kids.

You are doing nothing but talking out of your ass. Bioware had stated several times there is no cannon Shepard. All possibilities are up to us.

I disagree there were moments where Ryder and the crewmates got very serious. Like when they rescued the Salarian Ark and found out what the Kett were doing to them. Also Ryder, Jaal and the crewmembers reaction to the nature of the Kett in Volied. The game is just lighter in tone, but that didn't mean it did not have its dark moments where the characters reacted in a serious tone.

But the dialogue does often reflect it. An example is when SAM had to "kill" you in order to release the binders. Your squadmates and your Tempest crew were all concerned. I think the issue is that there were a lot more light hearted quests around like movie night, the main quest had a lot of dark moments where the crew reacted appropriately..... so far. Just still going through the main quests.