The Denser and Wackier approach to the series has seemingly reached its peak with the Shangri-Llama, a supposedly mystical shaman who will save the Earth from the asteroid. Is he a funny addition to the series or a stupid character already?
Julian, on one hand he's seen as an unnecessary addition to a franchise that has already being criticized for having too many characters and his subplot with Manny and Peaches is very disliked, while on the other hand, he's one of the few characters of who you can genuinely root for and is shown to be a legitimate Nice Guy in comparison to the rest of the Herd in this movie.
Broken Base: Any movie series will have one by the time it reaches its fifth installment, so it's expected for there to be some divisiveness.
Whether ending the series here is a good idea or not; while some die-hard fans may want the series to continue, especially due to this film's less-than-stellar quality being considered a disappointing end to the series, others wish that the 14-year-old franchise with increasingly negative reception be finally put out to pasture.
It's the Same, Now It Sucks!: One of the chief complaints against the movie is that it's unoriginal and not creative at all, and several critics contended that it felt more like a Direct to Video film. Manny's domestic issues in particular are criticized for feeling like standard sitcom drama .
That, however, is a turd. Explanation There's a scene where Crash and Eddy lick what is supposedly a rock after seeing Buck do so earlier (as a stand-in for relative age dating), then Buck says this line. Replace the rock with a good installment of a series or a good piece of media, and the turd with a bad one, and you have this meme in a nutshell.
"That's the stupidest thing I've ever heard!'' Explanation A line uttered by Neil deBuck Weasel upon hearing the raptors' scheme to avoid the asteroid. Used as a response to stupid comments or ideas on forums or social media.
Padding: After the herd learns of the asteroid, they spend the second act simply marching from one set piece to another, and don't even reach Geotopia until the last 20 minutes of the film. There are way too many plot lines going on in this film.
Rescued from the Scrappy Heap: Widely considered to be one of the film's few improvements over its predecessors is that Peaches is significantly more tolerable and mature in this movie than in Ice Age 4: Continental Drift. If anything, she's arguably more mature than either of her parents.
Rooting for the Empire: Many critical reviews expressed a desire for the asteroid to actually hit to ensure no further movies will be made.
Sequelitis: Collision Course is nowhere near the quality of any of the previous films, according to the critics. The idea of it being an unnecessary sequel is a prevailing theme in many reviews. The film holds the lowest critical score on Rotten Tomatoes (16%), not just for the series, but for Blue Sky Studios as a whole. It was also far less successful at the box office than its predecessors (though still managed to be profitable). An interview indicates they have plans for a sixth film, but said interview also took place before the film tanked at the box office.
The closure of Blue Sky Studios pretty much guarantees that a 6th film wont be made note though this may be for the best considering how utterly fed up critics and even audiences seem to have become with the franchise at this point.
Signature Scene: Bucks reintroduction in which he sings Figaro is generally regarded as the one good, creative scene of the movie.
Shira went from being a major supporting character in the fourth film to an extremely minor character here. She has a minor subplot in which she and Diego are discussing having children and wanting to gain acceptance from the other members of the herd, and a brief scene at climax where she and Diego are Manny's right-hand-men, but she's barely in the movie. Several people questioned why they even bothered hiring Jennifer Lopez to reprise her role that had barely any lines this time around.
Fans were disappointed that Louis, who was also a major supporting character in the fourth film, only got a mere, silent cameo here.
Some feel that since this film was hyped up to implicitly be the Grand Finale, they should've brought back characters from the previous films like Roshan, Carl and Frank, and the remaining pack of sabers from the first movie, Fast Tony and Cholly from the second, Scratte, the T. rex family and Rudy from the third, or the surviving pirates from the fourth for a major case of Back for the Finale. Even more disappointing is the fact that this may never happen at all, due to this film's negative reception and low box office draws very likely icing any chance of a sixth film.
The Dino-bird villains get some flack for not being as interesting or memorable as the previous films' villains since their plan to prevent the heroes from stopping the asteroid is utterly illogical note Which gets lampshaded by Neil deBuck Weasel and they constantly fail at every opportunity. However, one of the things that makes them stand out is that they are the first and possibly only villains who redeem themselves at the films end.