Well, Beckham is the most promising young player we've had on the team since Thomas. His rise through the minors was ridiculous so it built up hype, and aside from his start he's exceeded everyones expectations. Take how he's playing now, then factor in the logic that a player will continue to improve after his rookie season and it's pretty difficult not be excited.
I dont know how much better the guy can get though, what he's doing now is kind of ridiculous ever for a veteran player.