He's writes difficult poetry, only available through translation.
He's not Bob Dylan, or American.
"Transtromer, whose subtle, multi-layered work often deals with the relation between man and nature or the conscious and unconscious, is a regular on the list of favourites to win the prize." Simon Johnson, Reuters
What do I think? Dunno, really. I'm not a huge fan of The Poet With the Name That Sounds Like a Sci-Fi Movie. (or should I say Syfy?)
HERE be some useful links