Compared to other Batman animated movies such as "Batman: The Killing Joke" or "Batman: Under the Red Hood", then this 2016 animated movie was sort of like a massive step back if you are in the adult audience. However, I am sure that if you are a kid then you will enjoy this animated movie because it combines Batman and mechs.
Right, well it was the absurdity of Batman and Green Arrow both having humongous mechs available at their leisure, and also that villains such as Killer Croc and Bane were pumped up to gargantuan size that really didn't sit well with me. It was just too much, actually it was ludicrous.
The story is about Mr. Freeze whom turns Killer Croc and Bane into super-sized mutant monsters and sets them free upon Gotham. And in comes the caped crusader and his team of superheroes to save the day and save Gotham.
I will say that the animation is very smooth and nice to look at, and the drawing style is also quite good. But it doesn't have that dark twist that Gotham and Batman should have. It is just too cartoony, if you know what I mean. Hence the above-mentioned reference for this movie appealing to a younger audience.
The voice acting, which is really all-important to an animated movie, was quite good in "Batman Unlimited: Mechs vs. Mutants". Although it would be preferable if they had the same actor voice the same character in the myriad of animated movies. But that is perhaps just wishful thinking.
All in all, then I wasn't impressed with "Batman Unlimited: Mechs vs. Mutants", nor can I claim that I was particularly entertained by it. But my six year old son was enjoying it.