I'd argue people are pretty demanding but not in a "good" way. A lot of the later MCU movies did not exactly have great CGI for the money put into them. In terms of cinematography, music, etc. many were vastly inferior to Villeneuve's Dune. What the MCU audience was "demanding" of was continuity porn and rabbit hole/mystery box stuff. Guardians 3 was vastly superior to most late MCU movies because it WASN'T trying to put in a bunch of continuity porn to shill for future movies since it was the last Gunn MCU movie and it felt like "real" movie as a result.