Most people suck. Therefore, all forms of media mostly suck.
I basically use the names of the scores to rate each anime (10 = masterpiece, 9 = great, 8 = very good...). I always try to be objective, but subjectivity is necessary for proper judgement of a piece of media.
List of recommended anime/manga (no spoilers):
Baccano! : Taking place in the 1930's USA, about the the search for immortality and wars between mafias. All characters coincidentally gather together in a single train. A very chaotic but unique and fun writing style with very diverse characters.
Boku no Hero Academia : A great shounen anime if you want a breather from serious anime. While it doesn't have anything deep going on, it's highly enjoyable and just puts a smile on your face a lot. The characters are very lovable, simple, and rarely if ever inherently shitty. To describe the whole anime in one word: Wholesome.
Cardcaptor Sakura : (description yet to come)
Cencoroll : I'd want a whole anime out of this. The concept is very interesting and the animation and use of colours superb.
Devilman: Crybaby : A little daring series that gets you pumped. While it certainly isn't an amazing anime, it does provide what we need in the current anime industry and hopefully, this is the start of a revolution. I recommend watching it to experience this in front of your own eyes. It is something to be excited for.
Durarara!! : Similar to Baccano!, since it's written by the same author. Gang wars and supernatural things going on in modern-day Ikebukuro. While inferior to Baccano's plot and writing, Durarara!! has very good characters with an unconvential protagonist. Unconvential to the point many hate him.
FLCL : A classic everyone should watch. Mind-blowing animation and atmospheres, especially for that time. The story is abstract but contains themes of growing up and accepting your growth.
Fullmetal Alchemist: Brotherhood : Some people may find it tiring this anime is no 1 in pretty much every anime ranking list you encounter, but there's a good reason behind that. While the cast is extremely, extremely vast, each one of them is carefully crafted and well-developed. On top of that, they're all connected to each other like a huge spider's web. Not only that, the anime introduced me to philosophy and ethics. It questions numerous things of humanity and the concept of war. All of this, with a tint of slapstick comedy. You may also expect excellent animation done by studio Bones, an anime studio that tends to highly respect the source material.
Gin no Saji : Written by the same author of Fullmetal Alchemist, it also has very well-written characters that you won't forget so soon. Nothing bad really goes on in this anime and it's very much slice-of-life. It's a feel-good story that explains several ethics at the same time.
Mob Psycho 100 (warning: may emotionally wreck you) : About a psychic boy who has to come into terms with himself and his emotions, working with a crippled con-artist who claims to have psychic powers. About a boy who, despite his perfect grades and all, has an inferiority complex because he lacks the psychic powers that his brother has. About an egocentric boy who's never known how to be kind and completely relied on his psychic powers, almost losing himself. About a manipulative ghost that lingers around hoping to be worshipped one day. All of this in one story. Mob Psycho 100 is a highly complex story about the issues teenagers (and some adults) go through due to the pressures of society. Studio Bones decided to completely copy the manga's art style, and manages to turn it into one of the best high-quality animations I've ever seen in anime.
Mushishi franchise: An episodic anime that revolves around a man who travels around, discovering a new sort of organism, Mushi. Highly philosophical and makes you think about things a lot. On top of that it's very aesthetically pleasing for many people.
Saint no Onii-san : A comedy about Jesus and Buddha. If you've ever seen gifs of them in anime style, yes, it's from this anime. Makes a lot of references to the two figures' sources, so you need some basic knowledge to understand several jokes. My mum is a dedicated buddhist and found this hilarious despite the language barrier. That's how hilarious it is. Of course, this isn't for everyone. You have to be into this type of referencing comedy.
Tsuritama : Aesthetically very nice, with a light-hearted story that gets more serious by the end. If you wanna watch anime and learn how to fish, watch this. Also a little bit about social anxiety but don't expect too much of it. Not a lot of characters and they're all very simple. This anime teaches you to enjoy life, as it's a pretty simple thing to do.
Fullmetal Alchemist : See above. Goes more in depth and has more scenes than its anime counterpart.
Mob Psycho 100 : See above. Artwork's so bad it makes it hilarious, although the art improvement shows slowly but steadily.
Spirit Circle : About reincarnation and coming into terms with your previous lives, while retaining your own identity. You see everything from the protagonist's perspective, who's basically the villain the story. A little twist in the typical reincarnation/multiple lives theme and two people being connected with each other every life. Incredibly written story with a satisfying ending. The manga implies that you should read it slowly to take in everything carefully, but no one does that including myself.