I didn't like it.
I adored the animation- the lighting is absolutely beautiful and I'm still floored that they bothered to keep Spongebob animated on 2's and include smears. The art direction is extremely faithful to the series. I still think 2d animation for the underwater scenes would've been preferable, but I think we lost that battle a while ago.
I liked a lot of the references to the series and the various cameos and easter eggs. I thought some of the jokes were really funny, and in some scenes Sponge and Pat had a degree of maturity and wit not seen in the series since Hillenburg stopped showrunning.... but that's about it. The plot was a complete mess, with an incoherent live action sequence in the middle. Story structure was thrown to the wayside and for the first time in a SpongeBob movie i can honestly say I got the impression the writers didn't care very much.
The Kamp Koral segments were cute, and aside from the whole debate on if Steve would've approved of it or not (there's a lot of post-revisionism going on), they just felt shoehorned in. They could've wove them into the story into a far more natural way. Some of the humor was really funny! But about half of the jokes really didn't land, and there's a weird reliance on pop culture references (and references to Skype, Facetime) that feel.... decidedly un-Spongebob, part of the IP's appeal is a sense of timelessness.'
That's not even getting into the overuse of pop music. I have nothing against these songs, and Weezer's 'Take on Me' cover was cute, but again... it feels decidedly un-Spongebob.Steve notoriously resisted the use of pop music in the original movie and only included bands he was a fan of in it's soundtrack, so this feels like a betrayal.
Ultimately, I think this movie was a massive disappointment. Since the announcement of the switch to computer animation, and the Kamp Koral spin-off, I went in with low expectations, but I was hopeful. The animation was way better than I expected and the first trailer was okay. But I was still let down.
This movie ends with a dedication to Steve and I found myself questioning if it really felt like a faithful extension of the show. This is the first time a piece of Spongebob movie has felt like someone's interpretation of the series, rather than something that naturally exists within it.
I think it's time for me to admit to myself that this franchise is no longer for me. I love the art and expressions in the newer, Vincent run episodes, but aside from that they ring hollow for me. I think what appealed to me about Spongebob has long since gone. I honestly think Viacom should've taken Steve's passing as a bit of an omen. They may think SpongeBob can be their MCU, but the series's characters and dynamics only work bouncing off of eachother. It's a very tight, creatively-restricting universe. I really don't think Spongebob is like Looney Tunes or Scooby Doo, it's a singular personal vision.