Now, now, keep an open mind. This is my own personal opinion.
Yeah, I know, it still won't top Trouble in Tokyo, or even Spider-Man: Into the Spider-Verse, but I just love watching the original Titans again. Yeah, I will say, some of the writing can be a little immature, two songs weren't very memorable, the animation on the 2003 counterparts aren't as well done, and it just wasn't the best comeback for the 2003 series. But the writing, most of the time, can be very good, most of the jokes can be funny, it does have its more serious moments, the acting is great, the fight scenes are epic, and I just love how the Teen Titans of infinite Earths joined together.
Yes, there are a number of aspects the first film did better, mostly with the backgrounds, but I just preferred this.
Honestly, I'd take this over Kangaroo Jack: G'Day, USA!, the Lego Ninjago Movie, Tom and Jerry: Willy Wonka and the Chocolate Factory, the Norm of the North sequels, In Search of the Titanic, and Ice Age: Continental Drift, any day.
I can only recommend this who are interested. If you do enjoy both versions of Teen Titans, check it out. If you don't enjoy Teen Titans Go! At all, then don't watch it.
Overall, while I still wanted a season 6 of the original, I say this is a very decent movie.