Personally, in order of most to least disappointing:
Vanek - didn't score for the first half of the season, refused to shoot the puck,disappeared in the playoffs, completely disinterested in playing the Wild's system, disregarded the coaching staff, seemed to not care at all about playing hockey...wouldn't be surprised if he's out of the league in two years like Heatley
Kuemper - great first few games and then thought he got some bad bounces, then completely lost his confidence and practically guaranteed losses every time he was on the ice...supposed to be goalie of the future but looks like a mess
Koivu - had an uptick in production last year but this year went right back to his downward trend, completely disappeared in the playoffs offensively (again), makes big money without much to show for it
Stewart - played a few great games and then completely disappeared down the stretch and through the playoffs
Suter - big stretch of terrible play in the middle of the season, completely ineffective on the PP, never shoots the puck, very predictable, not great in the playoffs
Granlund - expected to take a big step forward and he just kind of went under the radar...had a bigger role but didn't really improve visibly or statistically, wasn't bad but wasn't great
Haula - supposed to come in to challenge for 3rd line center but was just flat out bad for half the year and in the doghouse through the playoffs
Bergenheim - I really didn't expect much out of him, but one point in 17 games...terrible trade
Pominville - he did a great job shooting but the pucks weren't going in the first half, and the second half he couldn't stop shanking and missing pucks in crucial situations...Wild could have won several more games if he was a little better
Brodin - didn't have a bad season but I wanted him to take a step forward offensively and he didn't...made some bad decisions in the playoffs that have me questioning him in a top pairing role