This is just a thread for me to list the animes I've watched along with brief descriptions as I remember them, colour coded to show watchability (in my opinion that is), and other such little pointers which might prove useful to those whom are in search of a new anime to watch. I will add on to the list overtime.

Colour Legend:
Purple - Extremely Good, worth watching over and over and over again.
Blue - Very Good, definitely must take time to watch.
Green - Pretty Good, whatever. No regrets, I guess.
Gray - Alright, better options out there.
Orange - Iffy, watch at your own risk.
Red - Horrible, don't waste the time.

Annotation Legend:
^ - Notably Funny
# - Notably Serious
+ - Must be watched continuously, wouldn't want to take breaks.
* - Can be watched brokenly.
! - Haven't watched too much myself, generally uncharted territory.

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[!] Black Blood Brothers - Follows the story of 2 Vampires of an extremely old and close to extinct bloodline as they move to a city controlled by warring vampire families and cracked down on by the anti-vampire human "Company".

[^*] Desert Punk - Follows a young, notorious, and uncannily horny Bounty Hunter on his adventures to capture the "big game" and keep his own ass out of trouble.

[#+] Fullmetal Alchemist - Follows two young alchemists on their search to find the mythical sorcerer's stone, and right their grievously made wrongs.

[^#*] Trigun - Follows a expert gunman as he searches for peace, personal and impersonal.

[^#+] Welcome to the NHK - Follows a Hikkikomori and his friends as he trys to break out of his hikkimoria.

[^*] Ouran High School Host Club - Follows a girl who disguises herself as a male in order to join a prestigious high school and accidentally gets pulled into the male "host club" which operates there.

[#+] Attack On Titan - Humanity has lived in peace behind walls from larger, and mindless man-eating beings called Titans. Until one day the walls come down. Sh*t just gets crazy from there. Must watch if you haven't.  

you have a lot to watch yet.  

I've watched quite a bit more. Just can't remember some. I've only recently started to watch anime once more, so I'm just going to update as I go along.