Dreamworks, Blue Sky, Warner Animation, Laika, Sony Animation and even Paramount/Nickelodeon have all done at least two films that is fantastic or A level imo. Illumination has one and that's Sing and that's an A-. DM1 and DM2 are solid Bs and everything else is mediocre to trash.
I'm kind of mixed on Illumination. I don't hate it with a burning passion like @WrathOfHan but I'm not supporting mediocrity either. DM1, DM2, and Sing are good films, Lorax I actually like, the rest range from mediocre to trash. (Pets > Minions > Hop).
I've taken my little cousins to every Illumination movie since DM2 also. Even though I disliked Minions, at least they had some fun. However Norm of The North was so godawful even the kids thought it was okay.
I was talking about DM3 box office. A sub 3x multiple for an animated film is not only bad but rare, only 4 of the top 100 animated films in America has had this happen. However Minions did excellently at the box office, but when you look at domestic, I'm not denying it had a great haul but it had poor legs.