It seems if one has a tough time following multiple story lines told through flashbacks (of thousands of years on top of that), this could feel disjointed and confusing. And if one expects much CBM CGI battle galore, this could feel slow and underwhelming where emotions take the front seat.
I am eager and curious to see how different it is from other MCU staples. Many of them, despite all cliches of a formula, are already pretty distinct from each other to me. I am looking more forward to this than Spider-Man, and hopefully the theaters won’t cut out the gay element (most like they will to get the kid friendly rating *sigh*).