If the majority of the space within your theme park is only nice, I think it's an issue. It's one thing if we're talking about a land the size of PoE, but Celestial Park is most of Epic! I get that there's a low ceiling for how exciting a hub can be for an average tourist, but I don't believe Celestial hits that ceiling.
If this is what Celestial Park will eventually look like, at that point I feel like all of my complaining will be moot. Tivoli is beautiful. Celestial in its' current state is just so, so far away from that.
I totally believe that in 15-20 years, Epic Universe will be an absolutely and inarguably wonderful destination park.