Dragon Ball Z Movie 11 Bio Broli is one of the most forgettable Dragon Ball movies despite featuring the selling point of having one of the most popular villainous character involved.
The reason why its ignored is mainly nothing really stands out. There is no big scene like Goku using a new transformation. No signature move is used to defeat the enemy.

But these alone wouldn't make a movie bad.
The action is really good. Bio Broli's power is justified being a clone of Broli. Every scene with Mr Satan is hilarious.

So how can this movie be considered bad?

Bio Broli's antagonist is Mr Satan's former martial arts rival. Some rich and fat dude. He wants to humiliate Mr Satan by letting him get beat up by fighters made from Bio Technology. So he blackmails Mr Satan to make him accepts his challenge.
Goten, Trunks and Android 18 get involved because 18 wants the price money Mr Satan promised. This movie should have been released around the end of the Dragon Ball Z tournament, that took place before Boo awakened, but it can't fit simply because Fusion isn't used.

Turns out that one of the Bio Warriors is a clone of Broli. It looks hideous which honestly makes people rather not want to see him in video games. When people say Broli has no personality they probably talk about Bio Broli. The guy can't speak and randomly destroys shit. No mimic no nothing.
It's not the only antagonist. The next one is gue that consumes anything organic it touches

They win through Mr Satan giving Goten a clue what his weakness is. And that weakness is one of the stupidest thing because it's basically everywhere so it would never really pose a threat after Trunks did a certain thing.

This movie is better than what most people would let you believe. It's not as bad as Battle of Gods or Revival of F. And one can argue if anything ruins Broli's character, its Dragon Ball Z Movie 10. Bio Broli is its own entity.
This movie also tried to focus on a new cast of character that aren't usually involved or get minimal roles.
Android 18 does something. Main antagonist wants revenge on Mr Satan. Goten and Trunks are the lead.

Sadly Goten and Trunks just aren't interesting characters and the movie wasted the opportunity to make us care for them. They were already annoying in Movie 10 and parody characters in the Boo Saga that made the arc worse. Now staring them in a movie was risky and didn't pay off simply because they are characters known to just goof around.

It also seems like the writers wanted to make a Dragon Ball movie by the style of the original. More comedic. Child protagonists. Mitged antagonist similar to Commander Red which both have immense resources to get what they want.

And I think that's a problem because people don't usually watch Dragon Ball Z to see these kinds of things especially in a movie that has Broli in it. A story with a character with a deep backstory, lots of symbolic imagery and muscle bound brawls. So Broli fans were disappointed.
Even if you like those things, it fails to catch the essence of original Dragon Ball since Goten and Trunks aren't like Goku outcasts from society. So they can't fit into similar situation where kid Goku would have worked better.
Which leaves both parties disappointed.

Overall, visuals are great and OST are good. Fight against Bio Broli was engaging but like Gotenks vs Super Boo it is pretty forgettable.

Wouldn't recommend this to anyone but it is not as bad as many make it out to be.