My handwriting sucks too, and much of it is nearly illegible, but I find that I have much better retention if I keep written notes rather than typing.

Even if some of my notes are difficult (or even impossible) to read, it's still sufficient to help remember what I felt so notable that I wrote it down.

I realize that everyone's not the same, but studies have shown that writing leads to better conceptual recall (but typing tends to record more information)