Yes [http://en.wikipedia.org/wiki/Gantz] and no [http://en.wikipedia.org/wiki/Lucky_Star_(manga)].
It depends entirely on the series. However, anime has no real age restrictions on how mature it can be, while most cartoons aimed at teenagers and up in the west seem to have disappeared. The only exceptions are comedy series like Family Guy or ATHF, but these aren't very "mature": in fact, they're almost childish at times. Anime tends to be the only animated medium with season-based plots and actual themes. In that respect, anime certainly is a lot more mature.
EDIT: Actually, when I wrote that I entirely forgot Avatar, The Last Airbender: which is one of the best Western cartoons to come out in years. Aside from that, most western cartoons are either aimed soley at children or older folks: there's not really much room in-between.
This is probably due to the same reason as an event I refer to as The Death Of Toonami: a bunch of parental groups went nuts at Cartoon Network for broadcasting material they thought was inappropriate. What these parents failed to realize was that Toonami was supposed to be a block for TEENAGERS... a sort of stopping gap between the kiddie fare and Adult Swim. Nowadays Toonami is no more, and most Western cartoons are crap, so... yeah. Parents are the main reason the maturity of western cartoons was stunted.
It depends entirely on the series. However, anime has no real age restrictions on how mature it can be, while most cartoons aimed at teenagers and up in the west seem to have disappeared. The only exceptions are comedy series like Family Guy or ATHF, but these aren't very "mature": in fact, they're almost childish at times. Anime tends to be the only animated medium with season-based plots and actual themes. In that respect, anime certainly is a lot more mature.
EDIT: Actually, when I wrote that I entirely forgot Avatar, The Last Airbender: which is one of the best Western cartoons to come out in years. Aside from that, most western cartoons are either aimed soley at children or older folks: there's not really much room in-between.
This is probably due to the same reason as an event I refer to as The Death Of Toonami: a bunch of parental groups went nuts at Cartoon Network for broadcasting material they thought was inappropriate. What these parents failed to realize was that Toonami was supposed to be a block for TEENAGERS... a sort of stopping gap between the kiddie fare and Adult Swim. Nowadays Toonami is no more, and most Western cartoons are crap, so... yeah. Parents are the main reason the maturity of western cartoons was stunted.