Cliché Storm: The whole movie, at least as soon as Robyn is brought in anyway. From that point the movie turns into a generic Disney-esque musical film about a girl trying to find her father, a plot already beaten into the ground by several past children's movies, all the while being pursued by a bunch of stock villains from every animated movie you've seen.
Crowning Moment of Awesome: When Robyn's father rescues her from the top of the burning house via helicopter. And accidentally leaves Tom and Jerry behind to burn, though that isn't the awesome part.
Designated Villain: Captain Kiddie's only "crime" was attempting to return Robyn to her legal guardian so he could collect the reward. Sure, he was greedy, but he had no way of knowing Robyn was telling the truth about how terrible Aunt Figg was.
Ear Worm: A couple of the songs definitely stay with you, for better or for worse.
Misblamed: Though the film makes it seem that Tom and Jerry have never talked before the events of the film, in reality many of the early shorts feature Tom and/or Jerry speaking, with Tom speaking much more frequently than Jerry.
Never Live It Down: Tom and Jerry abandoning their rivalry and talking to each other throughout the entire film, only to be upstaged by Robyn Starling and the rest of the human characters. Nearly everyone agreed the film completely missed the point of the series, and most subsequent projects to feature the duo have made sure to avoid this: Tom and Jerry still chase one another around, human characters take a backseat or are more minor characters, and above all else Tom and Jerry don't talk.
Nightmare Fuel: The aforementioned "Dr. Applecheeks closing in on the ice cream cart" moment. Brrr. His character in general counts, actually; portrays himself as a kindly vet who loves animals and allows people to drop off lost pets for him to take care of. But then he shows his true colors, as a greedy con man who makes money off of pets that he kidnaps and sells back to their distraught owners. All the while, he abuses the poor little creatures and treats them less like living things and more like money-making commodities. Even his own henchmen are terrified of him.
Older Than They Think: This isn't the first time that Tom and Jerry are changed from mortal enemies to best friends. The Tom and Jerry Show had the duo as friends and aired 17 years before the movie hit theaters. Problem there though is that's when the shorts were undergoing Seasonal Rot and aren't highly regarded by fans either.
Tom and Jerry also talked and sang occasionally in the original shorts, and on occasion were on good terms with one another in various shorts.
The Scrappy: All of the new characters created for this movie; Pugsy, Frankie, Aunt Figg, Lickboot, Captain Kiddie, Squawk, Dr. Applecheeks... and especially Robyn Starling, the girl that Tom and Jerry help to find her lost father, and the one responsible for making Tom and Jerry stay Out of Focus and making the movie being about Tom & Jerry In-Name-Only. The few that aren't universally reviled (Lickboot, Applecheeks to name a few) are only liked because of YouTube Poopremixes and memes.
Pugsy deserves a special mention, as he is the one who got Tom and Jerry to talk and sing about how they are best friends, despite Tom and Jerry being, you know, mortal enemies. Heck, the hatred toward him is so strong, The Nostalgia Critic even shoots the dog's head off in his review of the movie.
So Okay, It's Average: If not for Tom and Jerry being the (alleged) main characters, the movie most likely would have been forgotten within the flood of animated films that tried to copy Disney's success in the early 1990s.
Squick: Aunt Figg and Mr. Lickboot look like they're about to kiss at the end of their Villain Song.
Aunt Figg sucking cream off her fingers after eating an eclair.
They Changed It, Now It Sucks!: The general reaction of existing T&J fans to the movie making such drastic changes in tone and content from the original shorts.
They Wasted a Perfectly Good Plot: Given this is Tom and Jerry's Big Damn Movie, the idea of them talking and learning how to work together could have been an interesting idea, and one that fans have possibly speculated on for years prior to the movie's release. They could have interacted with various characters from across their episodes over the years, such as Spike and Tyke, Nibbles, Butch, and even a nod to previous owners like Mammy, and given the duo a great deal of Character Development by having them name their likes and dislikes, have a few heart-to-hearts, and end with them still possibly chasing one another, albeit with more respect for each other's abilities. Heck, the idea of it being an Animated Musical could have been handled interestingly enough had this been the case. Instead, we get a plot about a spotlight-stealing orphan whose legal guardian only wants her for her father's money, Tom and Jerry immediately learn to work together, little to no screentime is dedicated to the duo as individuals, the plot keeps introducing antagonists left and right, the only recurring character that appears is a cameo from Droopy, and the songs aren't even that goodcontribute nothing to the plot. The writing staff had perfectly good ideas sitting on a silver platter, and they used none of them.
Vindicated by History: To an extent; people still don't consider it a good movie but it's regarded as being better than some of the more recent Tom and Jerry movies that have been released (namely the infamous crossover films such as Tom and Jerry and The Wizard of Oz and Tom and Jerry: Willy Wonka & the Chocolate Factory; as cliché and derivative as this film is, it still has more originality than those).