Yes, I think that Robin Thicke's song "Blurred Lines" sounds like Marvin Gaye's "Got To Give It Up".   So much so that, had I been on that jury, I probably would have gone along with that verdict.

With that being said, there are MANY songs that sound SIMILAR.  I think Robin Thicke should have approached the Gaye family for permission to release the song (for a pre-arranged share of royalties).

This video shows how similar many songs are, using the same chords.