You don't go to these Marvel movies for an interesting plot or smart dialog. You go for the comic book superheroes and to see a bunch of stuff blow up. The plot of Infinity War is almost dumb enough to wreck the CGI action... but not quite.
Now, the stupidness is worth noting here. The villain of Infinity Wars wants to kill half the people in the universe as a means of population control. Um, yeah. Like I said... really, really dumb. (ha!)
Good (enough) movie.
thanks... yow, bill