My gripes:
1. How does IOI have military grade weaponry and an army when they're an entertainment company?
2. How was IOI allowed to raid the building where Z and friends were hiding?
3. The movie takes place 5 years after Halliday died, and the challenge was issued upon his death. In 5 years, not ONE person out of the THOUSANDS playing figured out to go backwards in the race that was meant to find an Easter Egg? really? really?
4. After the raid, the group KNOWS they're being followed. In fact, at the end of the raid scene as they're getting away, Aech says "they're ID-ing my van!" So instead of ditching the ride or switching plates, or giving the van a new coat of paint to cover up the scanned markings, they park in an alleyway and then continue using the same van?! SERIOUSLY?! You're being followed, you KNOW you're being followed, you KNOW they've ID'd your van, and you're gonna keep using it without making any attempt to prevent being caught?!?! REALLY!?!?
5. The background references are cool and all, but man, such a wasted opportunity. Easily could've had guest characters help out during a quest, or even use some of their tools during some sequences. The final battle sequence did it right by using weapons from various games, but it would've been pretty cool to see Z use tools/gadgets/tactics from various games to figure out clues.
6. How do all members of the Hi-Five end up in the same general location? Five random strangers meet online, easily could be from ANYWHERE around the entire globe, but instead they're a couple of miles from each other? Really? Showing Artemis contacting the members that are far away and then seeing the faraway members taking a flight or something out to the States would've made it much more believable.
7. F'Nale's entire role felt empty. There could've been so much development if she simply had a moral compass or even an agenda of her own. Her character felt like another random henchman with no stake in anything that ended up getting a bunch of screen time for no reason.
Edit: My score: 6/10. Enjoyable, not boring by any means, but tons of flaws that keep it from being epic. It had tons of potential, but story beats, basic logic, and unbelievable character interactions/character logic hold it back.