Weird question that you already know the answer to.
It was weird to assert that they were telling you everything is going on when you are midway through the series. We don't know how much is true and how much isn't. From what I have read of source material, there could be significant red herring's they set up.
The fourth episode was a clumsy, unnecessary, and unfunny exposition dump, and nothing that happens later in the show will retroactively change that fact.
Again you are assuming that you know everything that is going to happen. What a silly way to judge the middle of the story. Was it heavy on expository type information? Yes. Was it clumsy? Not at all. They managed to show (not tell) what it was like when the events of Endgame took place. They reintroduced an adult Monica and used her story to inform the audience with a whole bunch of backstory in a few minutes. Much more efficient than a flashback and not at all clumsy considering the territory they have to cover. You don't like the humour, fine, but its not objectively bad, but I can understand not liking it.
The fifth episode was overall an improvement, but it seems to be establishing a pattern of having these unfunny characters now providing a running commentary on what's going on in Westfield and what Wanda is up to. They've thrown the principle of "show, don't tell" out the window.
They haven't. Vision's entire storyline is proof of that.
The best (worst) example of this so far is the cameo at the end of the fifth episode. This is a jaw-dropping moment, and both we and the characters need a few moments to let it sink in...but no, Kat Dennings immediately has to open her big mouth and give us a lame quip.
It wasn't a lame quip. First off, there will be large portions of the audience who will not have
Days of Future Past and so will need to be filled in some way. Instead of devoting extra time to "showing" it, they made the choice to expedite the matter. It's a fair choice and one you have to make when you are juggling significant amounts of material like they are. It wasn't even a quip, it was a pretty concise expression of what happened in the context of the world Wanda created.
And just like that, the dramatic impact is ruined.
The dramatic impact was ruined? What impact do you think it was "supposed" to have? It wasn't a moment you enjoyed, sure, but again, there are huge amounts of audience who need the narrative to do more than just be mysterious because it actually takes a fuck load of background knowledge to keep up. I can vouch for this every time I watch an MCU property with my wife, who has seen a lot, but not everything, forgets things because she isn't a huge nerd like me and needs to be reminded of expository information.
I feel like your issue with how they handle exposition misses how well Wanda is being portrayed, how well they are taking Vision through his growing understanding or allowing for there still to be more going on than they have told you.
It's also objectively better than WW84 in every facet, js.