I don't think so, and I don't particularly like open world games. Now that I think about it, "like" isn't the right word. "Seek," I usually don't seek out open world games.
I realized in 2024 that it comes down to the gameplay loop for me, because I had been avoiding open world titles for years. Some examples from this gen that made me realize this.
Games I thoroughly enjoyed
Ghostwire: Tokyo
Outcast 2
Rise of the Ronin
Elden Ring
Games I like but are kind of a slog
FF7: Rebirth
Sand Land
Games I thoroughly disliked
Horizon
In Ghostwire, Outcast 2, ROTR, traversal is fantastic. You're free to pretty much go where ever you want and it's really quick and fluid. The combat is also really fun. They all have great missions too but that's secondary. All of these have checklists but I didn't find them to be a slog. Elden Ring speaks for itself.
With Rebirth and Sand Land, great games but Sand Land is too empty, there isn't much to do but pew pew dinos in your tank and the melee is really simple. The story, music, visuals, and overall gameplay are all great but it's just kind of boring after a while. Rebirth is just too big and the character interactions I enjoyed so much in FF7: Intergrade require you to do the most boring stuff imaginable. The combat is also a mess IMO. It works and I understand it, I just don't think it's all that fun.
Horizon, what a shit game IMO. You can't do anything! You can only climb on stuff with paint and there's so many rocks and objects that Aloy should be able to climb. The combat is not fun to me in the slightest and all the enemies feel like bullet sponges. I could not give a less of a shit about the story, it was interesting at first but eventually I had no clue who was who. Guerilla went all in on creating tribes and factions and terms, I could not keep track of it all. A repulsive game if I'm being honest.
So yea, I came to the realization that the open world aspect is no problem whatsoever for me, it's all about the gameplay loop itself. That's why I don't think open world titles are inherently mediocre.