I love David Lynch's work, but I haven't seen Eraserhead yet.
Mulholland Drive and Twin Peaks are great though.
Contrary to what people think, Lynch does have a plot and purpose for most, if not all, his works.
However, most of this meaning is lost in 80% plot ambiguity/surrealism, 10% red herrings and 10% condescending elitism from Lynch himself that throws people off and makes them believe that he's merely a hack director.