I prefer it to most because it's so lightweight and simple (and pretty as a result of this), but like you said, nobody uses it xD
On topic though, MSN is my primary messenger mainly because most people I talk to has it or Y!M, which also connects with MSN. I also use Digsby as a catchall for other protocols - AIM, Gtalk, and Facebook chat, and also for the Gmail and Twitter notifier. I don't use it for MSN because I want webcam chat and other features.