Anime, while an entertainment medium that is now widely enjoyed regardless of age, a lot of people that feels Anime is just for kids still exists. And while like in any other medium, there are indeed a lot of shows aimed at kids, the series we most love and discuss are probably aimed at a more mature Audience.
Last month Japanese site "Goo Ranking" asked their users the questions: What Anime series would you recommend for a mature audience to the point of get them hooked?. And while indeed Seinen genre is abundant on the list we get to see some nice surprises. Also of notice is how series like Cowboy Bebop or Evangelion are not on that list, that's why polls are so interesting. Here's the list: