James Jones is a free agent and Donald Driver had an injury prone 2010 season, so adding depth at the position was necessary. While GM Ted Thompson didn't draft a receiver in 2009 or 2010, he did draft one in either the 2nd or 3rd round from 2005 through 2008.
There are some question marks about him. Jersey Al points out that his route running needs work, and he often lets the ball get into his body instead of his hands. Mocking The Draft says he doesn't have blazing speed, but "he has a great initial burst" which reminds me of what they liked about Jordy Nelson. NFL Draft Scout had him ranked as the No. 49 overall prospect, so the Packers are getting some value too. It might be a year before he's ready to contribute as a receiver, but Walter Football points out that he can compete immediately as a kick returner.
He's the type of receiver that the Packers have looked for over the past few seasons, and he seems like a solid pick at a position that they needed depth.