I can understand why people are impatient but the guy is playing with two rookie receivers and from what I've seen they're really not helping the guy out. I know he misses a few throws, everybody does, but most of his interceptions look like his receivers fault from what I've seen.
I think a little of the blame can go on the offensive play-calling too. Say what you want about the guy's ability, there's no way he can't hit half his throws.. the Raiders aren't really giving him a chance. I know they want to stretch the defense with their speed and throw the ball vertically down the field, but if you have a young quarterback, you have to expect that to take some time. You're killing the kid's confidence when you ask him to throw 20+ yard passes all the time and he's not hitting the mark.
Giving up on Russell and getting a new guy in there really wouldn't change much unless both receivers REALLY progress and the play-calling gives the quarterback a chance to be successful. The Raiders would be better served utilizing the running game, throwing the ball short to their speedy receivers and letting them run after the catch, and throwing the deep pass in moderation. I bet Russell would do just fine in that offense.