If you deeper into the depths of Wikipedia you'll find he scored 12 goals with eight assists in 22 starts in all competitions which imo isn't bad going for a player in his first season, esp when jumping from Eastern Europe to the Premiership. He also bagged 10 goals in 12 qualifying matches for Croatia which is more than Rooney managed.
Also, this is interesting, December-February of his first season is when Henry suddenly went from being an expensive sack of crap to starting his journey to becoming the Premiership's best striker year after year... if Eduardo hadn't had his leg broken who knows what would've happened. If he recovers fully from his injury then I wouldn't write him off just yet.