Yeah, I think that's what it was for me, the fact that they didn't really show the character's relationships on any meaningful level. There should have at least been some short montage showing Reed/Sue getting married, maybe one of Johnny and Ben's bigger fights (they are friends in the comics but have a rocky relationship at times). They were casted great but we didn't get to see any real character moments from them that showed how they all get along, the closest we got was Reed and Sue arguing because of Reed's impersonal at times, practical parsing of a situation and the facts without thought for emotion, and even that was fairly more tepid than what you'd see in the comics.

For me, the bottom line is, I feel like the Marvel movies have this generic tone that I just can't get past. It's like how Marvel and DC have had "house styles" at times where the comic artists draw the comic in a fairly similar way making the comics feel homogeneous.