First I'll preface this by saying I genuinely enjoyed this show. It was very entertaining and definitely got me hyped. But I felt very frustrated many times so this is me letting it out LOL.
First of all, the way the games are animated pisses me off. The shots don't actually show the soccer playing--the frames are almost always static. I feel like the exhilarating part of this show should be watching and ACTUALLY WITNESSING how the game goes down, but instead, you end up being heavily reliant on the character's dialogue or thoughts to know what's happening. And for a soccer noob like me who is not well-versed in the world of soccer, it's just more difficult without fluid visuals.
Usually in shounen anime I can overlook the unrealistic aspects for entertainment, but somehow I can't for Blue Lock. The progression/pacing of the "evolutions" and awakenings and just improvements of Isagi and all the characters in general are absolutely ridiculous. It's just one dude after another. Like bro, if I were to be in the world of Blue Lock, I could've cured cancer with their default system settings. Just confine me in a several-month container lab and bam. I'll do wonders. That being said, I couldn't really relate to any of the characters.
Overall, Blue Lock is definitely an entertaining shitshow (a chaotic mess) to watch, but if you've watched Haikyuu and are looking for another sports anime to live up to the same expectation, you might find yourself to be disappointed.