you are spending too much time on forums to think if general audience cares that shit.
X-men is household name , its edgy looking which helps, last x-men movie for while and has actual actors instead of monsters cgi plus game of thrones actors while its super hot.
I don't think people care about the CGI aspect as much as you think. Regardless of that it's got an over the top draw.
GOT actors being as hot as it is the X-Men franchise hasn't been consistent in total sales with or without them. Godzilla has the film debut of Millie Bobby Brown which is getting the film extra media coverage.
Days of Future Past grossed more than 2014 Godzilla (and I think that was because of the old and new cast being in it). Apocalypse just barely went over 2014 Godzilla movie worldwide. My prediction is Godzilla:KotM will be better produced than the last one and have more word of mouth.
Super hero fatigue is real. Avengers are beating it out of us. Look at Deadpool 2.
Lastly, while the plot has been done already a few times for Godzilla:KotM we are talking about way old school Godzilla and not Hollywood Godzilla. I've seen the handling of Dark Phoenix already.
This is all from an old school X-Men fan, signed comics and all. Fox hasn't treated them as well as they could have. I welcome our Disney overlords.
Edit: I'm going to clarify my Deadpool 2 comment before it gets called out. Yes it sold almost equal to Deadpool 1. Yes it was the highest grossing X-Men movie (tells a lot for X-Men too). Unfortunately it sold less domestically.