Heroic age: Action/sci-fi. Awesome anime with a great story.
Code Geass: My favorite
action/sci-fi brain fuck plot
Death Note: Brain fuck plot. Must see, but only the first season.
Ichiban Ushiru No daimyo: action/comedy/fantasy. fucking funny
Nurarihyon: Action/comedy. You have to like the genre.
FLCL: Action/comedy. Funny as fuck
Hellsing Ova: Action with gore.
Needles: Action/comedy. Heavey on the comedy.
Beserk: Action with a lot of gore
Blade of the Immortal: Action.
Casshern: Action with a large story. Very difficult to understand untill the last few episodes.
Claymore: Action
Most gundam series.
Inuyasha: Action/comedy/fantasy
Kurozuka: Action/fantasy. Gory, very gory and has a great storyline.
Last exile: Action/fantasy. Feel good ending.
Maria holic: Comedy. FUCKING FUNNY.
Ninja scroll: Action. Lost of people dying
Rurouni Kenshin: Action played in medievil japan.
Rune Soldier: Action/comedy
Sengoku basara: Action/comedy set in the warring states era of japan.
Shaman king: Action/comedy
Soul eater: action/comedy/fantasy
The tower of druaga: Action/fantasy
Trigun: Action/comedy/sci-fi. good story.
Tytania: Action/comedy/sci-fi
Hunter X hunter: Action/comedy
Tekkaman Blade: Action/comedy/sci-fi. Has the most fucked up ending I have ever seen in an anime
XXXHolic: Comedy/fantasy. Awesome!
Highschool of the dead: -.- need a discription? Zombie survival and actually very nicely done. Equivalent to The walking dead, but in anime style.
Prolly haven't written down most of the anime's ive seen. But this is what I have seen and actually liked so far I know.