Ranking anime I've watched is difficult, all in all, but I try to be fair with the scores and stay kinda harsh with my judgements. It could be a lot worse. After all: 2.5/5 stars is a 5/10, which is not a bad score for an anime, just a "meh" level series or movie in my opinion. My top series so far are (not in any sort of order): Monster, Lain, Kino's Journey, Mushishi, Haibane Renmei, Boogiepop Phantom, The Tatami Galaxy, Kaiba, and Princess Tutu - with some honorable mentions of Mononoke, Fullmetal Alchemist, Ping Pong, and Koi Kaze. Favorite types of anime for me are drama/fantasy focused on character and story development, as well as atmosphere. Also anything with anthro characters like Shiron and Wolfrun, though I have yet to watch an anime with a mature story revolving around only these types of characters. If that ever happens I would probably weep with joy.
Regarding manga: I sadly have yet to read so many good looking series out there. I want to, but so many of these stories are not licensed anywhere and are even more unlikely to appear in real solid print, so I just have to be patient and look around. The few I've been able to read through are some yaoi, and manga related to anime that I've already seen, such as the amazing FLCL omnibus.
Feel free to ask me any relevant questions here, or comment with appreciation or rage. Preferably the former!