Raiders rookies have made little impact, aside from starting DT Eddie Vanderdoes

A starter from Week 1, Eddie Vanderdoes has been a big body in the Raiders' interior defensive line. Sergio Estrada/USA TODAY Sports

Here's a look at the first-half impact of the Oakland Raiders' draft class:

Gareon Conley, CB, first round: Having fallen to the Raiders at No. 24 overall after being accused of sexual assault -- a grand jury declined to pursue charges -- Conley has dealt with an injured right shin that wiped out training camp and preseason. He has appeared in only two games and is not expected to make another run at playing until after the bye. Grade: Incomplete.

Obi Melifonwu, S, second round: Unlike with Conley, the Raiders literally got nothing from Melifonwu in the first half of the season, as he was on injured reserve after suffering a knee injury in training camp. Drafted to help cover tight ends, Melifonwu played in the third preseason game before being shut down, and he was expected to be activated in time for the Week 9 game at Miami. Grade: Incomplete.

Eddie Vanderdoes, DT, third round: Although Vanderdoes has started all eight games at the season's midway point, and he has been a big body down low on the interior of the defensive line, he has only six tackles on the season -- one for a loss. He was expected to help with the interior push to help free up Khalil Mack on the outside. Grade: Average.

David Sharpe, OL, fourth round: Massive at 6-foot-6, 343 pounds and a potential heir apparent to Donald Penn at left tackle, Sharpe had been active for only one game by the season's midway point: the Raiders' Week 7 defeat of the Kansas City Chiefs. He played exclusively on special teams. Grade: Incomplete.

Marquel Lee, MLB, fifth round: Much was put on the rookie's shoulders early in the season, with no veteran experience at middle linebacker. He responded by playing solidly against the run. But an ankle injury and the arrival of NaVorro Bowman cut into his time after five straight starts. Grade: Average.

Shalom Luani, S, seventh round: Deemed a "football-playing Jessie" by GM Reggie McKenzie, Luani has appeared in all eight games, starting at Buffalo. His heads-up play in recovering an onside kick on the season's opening kickoff at Tennessee got Oakland's offense off to a quick start. Grade: Average.

Jylan Ware, OL, seventh round: Another big offensive lineman at 6-foot-7, 317 pounds, Ware was deemed a "dancing bear" by the NFL Network during the draft. His dance card, though, has not been punched, as he has been inactive all season. Grade: Incomplete.

Elijah Hood, RB, seventh round: With size and a build similar to that of Marshawn Lynch, Hood was seen as a potential follow-up to Beast Mode. But Hood has been on the practice squad, save for being promoted when Lynch served a one-game suspension, and Hood played eight snaps on special teams in Buffalo before being waived and re-signed to the practice squad. Grade: Incomplete.

Treyvon Hester, DT, seventh round: An integral part of the Raiders' defensive line rotation, Hester was actually running with the first-team defense in training camp. He has eight tackles. Grade: Average.