I am a bit of a cynicist, and I may be a bit biased, but I also have some traumatizing memories involving a certain plastic toy and a hospital visit. I don't have much against bronies. Some of my best friends are, after all, bronies.
Adventure time is a cocktail of randomness and unexpectedness. Nothing too good, nothing too bad. It's OK, but would watch something else. It also gives me a minor migraine if watched too much.
Serious? No one watched Smile HD?