Well, I'm just an amateur anime watcher, I'm new here, and I hope I'll have the chance to enjoy my stay here. (this was written 5 years ago, now I'm not so new lol)
My Top 5 Anime (outdated)
I could say Gunslinger Girl kinda dragged me into this, as it was one of my first japanese animation experience. So it'll always stay as my favorite and special anime. After GG titles like Serial Experiments Lain, Paranoia Agent, Elfen Lied and then later Death Note completely made me a fan of this genre. If you haven't seen any of these.. lucky you!
I follow my simple how-much-was-I-entertained rating system. So if I gave Monster, for example, a low score it doesn't mean I think it's a bad anime. It's good, but I found it too slow, didn't like the ending, or any other elements which drags my entertainment level down decides how many stars it'll get. So basically my thoughts after I finish a show are more or less as follows:
3.5 and up - from good to very good, entertaining watch.
3 - average, ok.
2.5 - just plain mediocre.
2 and less - from bad to worst.