There are always those who get more than they deserve, say Javier Hernandez (who has a similar scoring ratio like Daniel Sturridge during his loan spell to Bolton), but there are certainly those who are not as bad as we perceive them to be! If someone asked me who I think the most underrated player is, I'd always have gone with Yuri Zhirkov, who never got the chance to prove himself in the Premier League, his best match being a 7-1 thrashing of Aston Villa, when he won 2 penalties. However, the name of Henrique Hilario doesn't take more than a fraction of a second to come racing into my thoughts...
