This show is extremely bland and generic. When I first heard this was made by Butch Hartman, I was pretty shocked to hear that the guy who made The Fairly OddParents and Danny Phantom, managed to make such a forgettable, one-dimensional show, featuring a concept that's been done hundreds of times before.
The animation is lazy, even for Flash. The characters have no personality and they all fall into stereotypes, that we've seen many times before. Unlike with FOP and DP, we get no introduction to the show, and no explanation as to how Bunsen came to be and how he entered the life of Mikey. The first episode just starts, with them already being friends, expecting the audience to just accept the fact that a boy is friends with a monster.
The main villain, Amanda, is very dull and her main goal is to get rid of Bunsen. Her motive to do this is unclear and apparently non-existent. Every character plays the role of someone like the villain, comic relief, best friend, love interest, etc. but none of them do anything new with it. Every episode is just as bland as the characters, lacking any intriguing stories or funny jokes.
I find it amazing that such a bland show came from such an amazing writer. At least most of the time, when good writers go bad, you can tell they're at least trying to do something new. This time, it seemed like he just came up with the idea off the top of his head and produced the overall, idea for the series in a couple minutes. Bunsen is a Beast is a very mediocre and unfunny show and if you gave it a chance, you'd find yourself bored to death, halfway through the first episode.