I love the ignore feature and have a rather robust ignored list - somewhere close to 400. I really like this feature mainly because it reduces the amount of text on my screen by removing chat, or potential chat, that I want to ignore. Additionally, the social absence of certain players improves the game immensely for me.
There are various reasons why I put someone on ignore.
1) Entire conversations in a foreign language
2) Begging
3) Cussing
4) Spamming nonsense
5) Insulting remarks
6) Stalking me
6) Players whom I have no desire to interact with socially due to their personality
Putting someone on ignore also prevents them from sending me mail. Funny, though, if I take them off ignore, the sent mail suddenly appears in my inbox.
One thing I don't like about the ignore feature is people don't know thay are on ignore. I wish some kind of automated message, perhaps even written by the player who is using the ignore feature, were sent to a player who attempts to send a private message or mail to someone who has them on ignore so we wouldn't be waiting for a response. Well, the mail comes back after 30 days if it hasn't been opened, but...
I know some players never use the ignore feature or dislike it.
How about you?
Yes, anyone who has ever pulled the "I'm not getting on until you give me ____." when the next level is an arena. That really provokes my contempt and ire.
~Luke