So many. For the biggest ones...

My Hero Academia - I made it through two seasons when it was hyped, completely lost interest after that, but it seems to still be considered to be really big.

One Punch Man - It amused me but it just felt like a constant gimmick.

Clannad - The sheer timidity of the characters put me off.

I could probably have given Hunter x Hunter a better shot, but it just didn't grab me. I feel like it's the kind of anime you have to grow up with. I haven't bothered with actually trying to watch Naruto, One Piece, Gintama, Bleach, Sword Art Online, Evangelion, Tokyo Ghoul, Fate, Fruit Basket or Jojo yet either. I don't think I'll ever try the first four, might have a look into the other someday though.

For those that I do like, I find that my anime preferences fall into three categories:

Serious: Attack on Titan, Ghost in the Shell, Erased, Planetes, Gangsta.

Slice-of-life: Nana, Higehiro, Rascal Does Not Dream of Bunny Girl Senpai, Golden Time

Exclamation Marks: Food Wars!, Haikyuu!!, Btooom!, Toradora!

If it can combine two or more categories, all the better. If it can't meet any of the three then clearly it's not for me.