Is he better than Weedon? That is all what we really need to know. Granted that is setting the bar low, but it's what we are dealing with.
He's not an almost 32 year-old-guy who's going to make the mistakes a first or second year player would make. Pretty damn good head start.
He's also not a guy who's going to be able to win you a game single-handedly. While Weeden on his best day might be able to hang enough points on the board to win a shootout, Moore probably wouldn't. On the flipside, Weeden on his worst day will probably cost you the fucking game without the opponents offense doing anything to speak of. Moore on his worst day may not get you a lot in terms of points but he's not a guy who's going to spot the other team 2 or 3 TDs.
Perhaps the biggest upside over Weeden is the fact that he's not a fucking soulless day walker.
Smaller guy with inadequate arm strength to be a true quality starter in the NFL, but smart and able to handle the situation. Accurate and can read defenses.
Is he better than Weeden? Probably yes and no. If each had to fill in for 8 games it's really not going to matter, but if you need a guy who can step in for a week or two and won't completely fuck your chances of winning or puss out and throw short passes all day then I would say he is better than Weeden.
Not that it matters cause he's going to the PS.