Calling this movie a piece of junk is in fact an overstatement. I didn't have great expectations, after all 20 years have passed and sequels almost never can hold the level set by the original movie, but this one falls flat even without expectations.
While the first movie had a story that contained a lot of humorous elements, this one tries to make us laugh while building a fake story around the pretended and forced laughs. Thes laughs become boring after the first 10-15 minutes. It was quite stunning that all the people sitting there with me waited for something to happen, but that something didn't seem to happen. In the final 30 minutes I heard no laughs from the audience.
What's the story about? A journalist mouse called Stanley finds a remote cat tribe in the jungle that hasn't become pacified by the evil robot dog machine created by the mice in the first part. Upon learning this fact from the trapped Stanley, the cats seek revenge and try to help their comrades. So they summon Moloch, who is the deputy Satan in cat hell. From this point on, we see a remake of the movie's first part, although this time the creators spiced it up with a little Matrix-style-kick-ass scene and some Pokémon frenzy. This may make the population under 10 years laugh, but the movie's main audience is in its 20s or above.
The creators also throw in some old characters for good, but even these characters seem tired and boring. The rats (4 gangsters) have some good scenes, but their vocalization is so bad that even these scenes fail to entertain. By the way, when we first meet the rats, we are already so numb from the previous scenes that no laughs are provoked. Dick, who lives with the blood sucking rats in Mexico, also comes back and he is a good epitome for the movie. He's tired. He's old, but tries to look young and fresh. He was once funny and believes that he's still funny. He's not. It's like entering the Epson derby with the Trojan Horse.
What's the final analysis? This is crap and so bad that it doesn't deserve a single point. This is a zero or rather a minus ten. This is how not to make a movie. This is how to spoil fun. This is how to throw mud into your own face and the audience. What a waste.