I think "sucks" is way too strong. He is not a long term solution of course but seems more than capable of running things until Manuel is ready, then as a capable backup.
All the people that are hell bent on getting Manuel starting NOW puzzle me. I don't care if it takes the entire season, I don't want him in until Marrone knows he is ready. For example, EJ seems to get happy feet real easy so far. That is OK in camp but is a sure way to get himself hurt in live games.