I partially agree, but a few points:
• What you're talking about isn't CGI. It's simply editing a scene from another movie into a clip. IGN just edited some shots from ASM2 into the Avengers trailer.
• In my opinion, this clip is up to Marvel's standards. Whenever Feige talks about Spider Man in the MCU, what does he talk about? Spider Man's humor. And that's EXACTLY what's shown in this clip. It's subtle, it's short, and it's exactly what Feige was talking about. It's a perfect introduction of Spidey into the MCU in my opinion.
• The clip you've shown isn't really the same as the clip shown here. Yes, it has sort of a camera effect to it, but it's more of a low quality edit imo. Everything looks like it's been edited in an editing program to fit into a YouTube video, whereas with this clip and the (Batman v Superman leak), it looks like it's shot in front of a theater screen. And plus, the scene you've shown just looks fake, while this one (even though it might be fake) is VERY convincing.
• Tbh, this one's kind of strange. Yes, Feige and Joss said there isn't a post credits scene. But, what if they said that JUST because they knew that people would be suspicious and stay anyways? It's smart. They know we're smart and they know we'll stay regardless of what they say! So, this one can go both ways.
• And for this one, we know they're going for a young Spidey, so he's going to sound young! Even if they casted Dylan, they probably want him to talk in a higher pitched voice to sound a little younger. And remember, this was shot with a potato, so the sound quality is kinda shitty. It might sound better if this scene is real and we see it in the theater.
But honestly, we're just gonna have to wait and see...