I did not care for the art style. I'll probably read the manga one day.
The last anime that blew my mind was Gatchaman Crowds, which basically takes the whole superhero idea, and then turns it on its head in the most perfect way. Soundtrack was amazing too.
I really loved Witch Craft Works as well, which seems like it was going to be a bad magic based harem show, but that never happens, and then the plot constantly collapses on itself. One moment could have the MCs shopping at a store, only for a car to get thrown into the store out of nowhere, start a fight with another character, and cause so much damage that it causes another character to go after the main villain because she thought she did what the MCs actually did and the entire plot she was building up over several episodes just suddenly stopped. This is a regular occurrence in this show, but usually with more giant magical robot rabbits fighting or teenage punks in animal pajamas taking over a school, with most of them smoking. I love it so much.