Firstly, I rarely re-watch anything because I like to stay up-to-date. My rating is based on likeliness to recommend. Also, I rating out of 5. (less room for compromise) As for manga/novels, I mostly read what I'm not watching. I don't read ahead unless the adaptation doesn't follow the source material. (Ex: TWGOK) Sadly, most of my favorites end up on hold/dropped and I start something new.
Now, my preferences: mystery, comedy, action, adventure, slice of life, sports, and romance; seinens and shounens for the most part. Most of what I've watched falls under one or more of these, so I've decided to organize my list accordingly. I read shoujo and josei on occasion. I might tag ecchi/harem in the future to separate it from traditional romcoms. Click "more" to see my comments.
As for dislikes: Supernatural, Historical, Sci-fi, Yaoi/Yuri & the like. Just a reminder why I have a hard time sitting through an episode of Gintama. As for romance, I just have a hard time watching series with only one gender. It doesn't even have to have Romance. If it includes Music or Sports, I make exceptions; but I tend to avoid fanservice if I can. Supernatural, Historical, & Sci-fi can be hit or miss; so if your looking for any of these in my list(s), please look elsewhere.