The Portland Trail Blazers enjoyed a successful season that finished with their first playoff berth in four years, but their offseason has begun after a first-round series loss to the San Antonio Spurs. The Blazers will now evaluate their roster to see who worked, who did not, and figure out how the team should move forward. Here are the three biggest disappointments on the roster for the Blazers this season. Vit Krejci: Trade Deadline Dud Portland Trail Blazers guard Vit Krejci warms up before game one of the first round of the NBA Playoffs. | Scott Wachter-Imagn Images While many expected Krejci to provide the secondary playmaking and size that the Blazers' second unit lacked when he was acquired in a trade from the Atlanta Hawks before the deadline , his production remained largely theoretical this season. On film, his defensive rotations often lagged a step behind, and despite shooting a high volume from deep, he shot 30.3 percent mark from the perimeter.…