If it's not suggested already, I was wondering, any chance MU will have an option like 'fav'
Its hard to follow through the complete collection and remember which one that I actually like.

Something similar to 'fav' at least. Or is there already one that I dont know of?

Sorry for the trouble.

You can create a custom complete list for that by using the "Edit Lists" link in your reading list. Just create a new list and set it as a "complete" list (instead of a reading or wish list).

I have a "recommended" list, a "highly recommended" list, and even a "top ten" list (these are public so you can check them out). I also have 13 more custom lists which help me in sorting my wish lists and completed stuff. Hope this helps.

I find it intriguing how a manga can be one of your favs but at the same time you don't even remember its name. Oh well.

Issues with auriga suggestion: yeah, you can create a new list, mas how will you know which list is that, since the icons are the same? I think this problem could be simply solved by implenting a new icon (a heart or a star, for the favs).