I discovered an article reviewing the studio's upcoming movie, Sing. While the article's criticisms apply primarily to Sing at first glance, the trend extends to Illumination's other projects as well. The article by A.V. Club also concerns a number of Illumination's other films, either directly or indirectly. The criticisms that stood out as the most accurate to me were the ones concerning the humor of Illumination's films.
As the article summarizes quite well, much of the humor presented in Illumination's films relies on juxtaposition and relatively immature jokes. While they can occasionally warrant a chuckle, it's rarely consistent enough to keep me comedically engaged. There are times when such humor works, but only in smaller amounts. The first Despicable Me knew this fairly well, and blended the studio's style with its signature humor well enough to produce a smash hit.
Where I disagree with the article is on its criticism of the studio's animation style. While the character designs aren't always appealing, given the exaggerated torsos and tiny feet indicative of many characters, it still creates a genuine and appealing appearance.
Despite my own criticism of Illumination's work, I still see the appeal it holds for others. The jokes and character styles are more suitable to a younger audience, and while the article claims that the movie would not likely hold the attention of its target audience, I must disagree. Sing is, for the most part, another fairly generic Illumination film. However, if you're a member of the studio's younger target audience, a generic Illumination film isn't a bad thing.
While I haven't seen Sing, and likely won't bring myself to watch it, I have seen enough trailers and Illumination films to know that this one will likely be more of the same. The article doesn't address this trend as heavily, as it primarily concerns Sing, but it isn't hard to notice the trends emerging with the studio. As an animator, it reminds me of the age old maxim: Know Thy Audience. If you know who you are trying to appeal to, then you're more likely to succeed as an artist. In that regard, Illumination succeeds as a studio, appealing to a younger and less cynical audience, even if that means it doesn't look as great to the rest of us.