I think that his early work up to Replica is fantastic however even in Replica he started to use sample-based approach instead of minimal arpeggiated ambient style and I don't really like the change. Can't get into two last records.
Iceage has only one truly great record, wichs is the last one, so i think is debatable if they are a essencial band from this decade. Their first two records are good, btw, but nothing groud-breaking imo. K. Dot and the Frank Ocean are definetly going to be remembered artists from this decade on the mainstream side, too.