Grudge Match came up with the concept, but failed the execution. This film is literally Rocky Vs Raging Bull (unfortunately in more ways than just the lead actors) and so it fails to take itself seriously once they set that up. It's as though the writers were too proud of the concept they created that they weren't bothered to do anything worth watching after that. The film is full of juvenile humour, bad acting, cliches and characters that we just don't care about.
The film's infrequently funny. This is now two Robert DeNiro comedies and two Kevin Hart comedies that I've seen so far and all three of these movies have failed to impress. The film decides to replace its one or two boxing related jokes that actually had me laughing with old man jokes, poo jokes, fat jokes, fart jokes, "white man stuff" jokes, sex jokes, racist jokes and Kevin Hart... It makes for a disaster of a comedy with a premise that could have made for a very entertaining movie. That may sound like a wide range of jokes, but trust me, it's not. Grudge Match is like an Adam Sandler movie, but without Adam Sandler.
There wasn't one character in the entire movie that I could care for or relate to. All the characters are underdeveloped and just uninteresting. They're all constantly making jokes about other character's races or age and this makes them all come across as assholes. There's no need to care about them either because let's face it, the people who enjoyed this movie didn't come to watch a deep, moving character driven boxing movie which is what made Rocky and Raging Bull such classic movies.
The film is both predictable and full of clichés. The predictability of the film doesn't come from the trailer, which gives away everything anyway although I won't take that away from the film, but from the film as a whole. It tires so hard to be a funny, moving and somewhat inspiring boxing movie, but it comes across as the exact opposite. Every character goes through their own clichéd story arc with a predictable result for their character.
To sum up, Grudge Match sets itself up for what could have been an awesome movie, but turns out to be a juvenile, infrequently funny mess of a movie that's predictable, clichéd and full of dull characters we don't care about.